If we're talking about IRL encounters... This is probably gonna be incredibly sappy but whatever.
I've told this story before but one of the reasons I really grew to hate SJWs was because I essentially lost a friend to their ideology, and back before I developed a thick enough skin for this stuff I was pretty harmed by it too. That's of course very dramatically stated as we had grown apart in other ways, but it played a big part. She and her sister were both pretty sheltered growing up; they were both home-schooled (not for religious reasons though). So I imagine that made them pretty susceptible to the emotional manipulation and shaming of Tumblr, which they both joined in its early incarnation. Soon, everything followed: Pink hair, septum ring, and an extremely judgmental attitude toward everything I said or did. The older sister became a hyperfeminist ideologue who threw out anything she liked before and chastised others for it as soon as it stopped reflecting her politics. People like this who cannot separate the appreciation of art from politics have since become one of my biggest pet peeves. The younger sister wanted to start taking testosterone, adopted the they/them pronouns, "genderqueer" label, etc. I guess "they" could be, but it reeked of transtrending to me. Given that she's only 15 too this seems like a particularly dangerous move if it really is only pretending.
Now, I was following her on Tumblr and Facebook at the time so I absorbed everything she said. I've always been extremely susceptible to guilt, and the mass-shaming social justice types use was something I'd been harmed by in the past. When I was a young teen I had a lot of times where I hated myself for being white, male, etc. before I matured enough to realize I didn't have to answer for my entire race/gender. My friend essentially dragged me back into that state of mind. It was really unhealthy because I noticed I was taking everything she said at face value because "I don't want to be sexist/racist/homophobic/etc. do I?" One of the most notable moments came when I was feeling really horribly about myself and had to show a friend the blog she'd linked to. He immediately was shocked and said "This is just petty bullying. I can't believe you're taking this seriously." Looking back, I can't either. At the time I was shocked. I thought "Bullying? This is just fighting for equality!" It's scary how much denial I was doing. My friend was awesome by pointing out that an upper middle class, HOME-SCHOOLED white girl complaining about oppression seemed really ridiculous. But being drenched in this was a very educational experience, it taught me to be incredibly skeptical of labels and ideologies, even if they seemed to mirror myself.
The final moment where I knew I had to break with these two was where I was having a crisis over her making fun of "not all men". This fucked the younger, more naive me up. Because it robbed me of avoiding their bile directed against my gender. I texted her asking "What's a more appropriate way to say 'not all men' so people can know I'm not as bad?" She responded by saying "Well, you should never say anything like 'not all men' because the truth is that pretty much all men ARE that bad. You just have to have a really anti-sexist attitude." Gee, thanks. I read that and realized that if someone was really far-gone enough to truly throw out an entire gender, they really were too much for me. It's especially ridiculous because while she said "not all men" was the wrong ideology, she was also dating a white guy at the time (even though omg muh open relationship lolol), so it seems like she had to have been thinking he wasn't like "all men". Blatant doublethink. Now she lives with that guy up in riot grrrl central in the Northwest and I think has been fucking like 11 (!) other guys in addition to him. I worry for him because while he knows it's supposed to be open, I don't think he's as "open" as her so I sometimes worry about how that makes him feel. I don't mean to denigrate open relationships, but that is just skanky as fuck lol.
Also, I just want to say that their hero-worship of Beyoncé was pretty hilarious to me. The older of these two sisters was literally CRYING tears of joy watching her Girls Run the World performance and telling anyone who didn't like it that they were misogynist. I'm not trying to discount her completely, but I seriously have to wonder how much of Beyoncé's feminist image is marketing playing to young college-age Tumblr girls. If her FEMINIST label really is a marketing thing, then holy shit for people so disdainful of capitalism they're being played like utter fools by her.
I've had one or two other experiences with SJW types but nothing so extreme. I saw a poster on my campus the other day that said "ARE YOU AN ASEXUAL, ROMANTIC-TYPE PERSON?" followed by an email. I imagine it was a group to discuss Doctor Who and drink tea and whatnot.
But yeah, common feature of all the SJW people I've met is that they're incredibly passive-aggressively bitchy in real life and seem to do this stuff on the internet to feel like heroes. I think it's pathetic.
(It's one of the reasons I first joined the Kiwi Farms, hearing people of all walks of life finally rip into these exceptional individuals gave me such an incredible peace of mind

)