That won't protect you. When your employer is actively signalling and funding support for particular groups or political positions, failure to join in is taken as a political action, and you might get attacked by co-workers for being anti-group or anti-position.
I don't know what one needs to be protected from. If your coworkers are harasssing you for not being political, that's usually the point where you escalate the issue. If that doesn't get you anywhere, that's a signal to leave (and by leave, I mean by not announcing it to the world with a "Why I left X" blog post).
Maybe I'm lucky, in my 25+ years of working, I haven't had to deal with that level of unprofessional behaviour (but I've also generally avoided working with startups and "interactive" agencies for the past 10+ years).
Counter-point: the "silence is violence", and the "being silent is being complicit" are somewhat popular suppositions. You can find public posts chiding people with those words for not being politically active enough.
Generally speaking, I treat coworkers "like a customer". I try to be respectful, polite and professional. My work can speak for itself. If that's not enough, then so be it, because I don't have time for other people's bs.
FWIW, I see those chiding posts in my FB feed, and I don't put any stock in them. Most of the people in my feeds post them in lieu of being genuinely active, as though the act of posting is an act in itself. That's their right and choice, and it's my right and choice to ignore them.
That won't protect you. When your employer is actively signalling and funding support for particular groups or political positions, failure to join in is taken as a political action, and you might get attacked by co-workers for being anti-group or anti-position.