If you totally lack a social media presence, I would argue that it's pretty possible to feel out folks in the workspace who may be sympathetic or otherwise veer from the extreme and the absurd. I suppose it does require a bit of social awareness, but I never had much trouble with it; it's pretty easy to tell what people have their lives together, and what people are neurotic basket-cases. If some schmuck has taken umbrage with me, lacking any social media to bombard only gives them the ability to go after you face-to-face, and they're uncharismatic stuttering cowards.
The problem is, every center-left, center, center-right, and right character I've met in these spaces has been a very life-oriented person. They've got goals, they want to achieve them, they want to earn a paycheck and do good work and turn that into bettering themselves and their lives. Might be a little quirky, but generally they're solid - why would this kind of person be drawn to a job that essentially involves tard-wragling 24/7?
But the unhinged people who have emotional breakdowns every 5 seconds, treat people like shit, preach the evils of racism before bitching about pajeets not even five minutes apart from each other... who bring their problems to the office, who are obnoxious and insensitive to everyone around them. Well, what's a little tard-wrangling if it lets them get power and authority over other people? Their own lives are in shambles, but that's all a necessary sacrifice for the good of the cause, you see. So it is that these extreme elements are almost always the ones that trickle into HR, because who the fuck else who has their shit together wants that?