I hear you. As you can imagine, growing up in a small West Texas oil patch town, I knew a lot of loud, brash teenage girls in high school. Some of them knew nothing but privilege growing up. Others were products of "oil field trash" families. Many were like Ruth from the "Ozark" show without the cunning derring-do who've grown up to be a bunch of bitter Darlene Snells. Most of the rich ones turned into Wendy Byrds (a few turned out awesome, though). Still, most are despicable in different ways, but one thing the shitty ones almost all share is a lack of shyness about speaking their politically polluted minds on fucking Facebook.
I'm not active on the site anymore, but when I was, I decided at some point that there was no good reason for self-censorship. My rationale was that they needed to realize dissenting viewpoints among people they actually grew up with and personally know exist. We Texas progs are often accused of living in a liberal bubble, but I can assure you many of them are more out of touch than you can imagine, still living in the wastelands or now hiding in their North Texas suburban McMansions. Facebook wasn't their personal megaphone to be complete cunts.
They need to know that the guy they may have made out with, played in band with, sat behind in class, or voted for in a student council election is a gotdam proud liberal who can still out-smart them, out-debate them, and out-asshole them, if needed (I very rarely actually used that last one, to be honest). All of the above also applies to the guys, but, on the whole, they were not nearly as active on Facebook.
After the 2016 election, one guy I went to high school with now living in Lubbock actually went so far as to create a private FB group for all the other liberals from that town, either still living in West Texas or elsewhere, to commiserate. It was like a Super Secret Squirrel lifeline, which more-or-less acted as a safe place for the liberals who were still living out there among the fascist theocrats and for them to know they were not alone. I can honestly also say I was pleasantly surprised a few times by those who turned out not to be Trumpers.
I'm not sure what my point is with this rant other than to say why give them tacit permission to think they are in the entitled majority who can bully everyone else with their bullshit. I'm not saying you should be a dick about it, but I also know it's not healthy for someone like you to self-silence. Who knows, you might also end up giving permission for others you know from the past to speak up if they feel like they could be ostracized by all those "mean girls."