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.
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).
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.