I have a friend who's MtF and thankfully she's given a wide berth to Tumblr and the like. She doesn't go two seconds without saying how much she's being discriminated, or pointing out at everybody she meets how much of a tranny she is. As far as I know, in fact, she tries to bring it up as little as possible because surprise, she does have a legitimate, diagnosed neurological disorder and just wants to live her life. I'm not going to go ahead and fuck her just because she's female-passing and we've known each other for well over a decade, but this is what brings me to the next point.
In my opinion, the hatred towards transsexual people stems both from how attention-grabbing they're perceived to be, especially the SJW types, and how unnatural they look. Think about it: we, as human beings, have deeply ingrained mechanisms to tell at a glance, no matter the race, whether a person may be healthy or not. We have an active response we have to consciously fight back against every time we see someone with a big, ugly scar on their bodies or any kind of deforming disease or condition, because we know that person is no longer healthy and our instinct tells us to get away. That response is closest first to fear and disgust that we have more or less tamed into something akin to pity, because that's what society dictates to us. Androgyny is confusing, but that's rarely the response most of these trannies entice on normal people. They look weird, deformed... unhealthy. And the way they act merely confirms that gut feeling.