"Rule of thumb" I quit using this one after learning that it referred to a rule where you could legally beat your wife with a switch no wider than your thumb.
"Getting gyped" Learned this one is about associating gypsies with getting screwed over, so people started saying they got gyped because something bad happened.
Stuff I thought was completely innocuous but turns out has really bad connotations, so I dropped them.
The problem isn't with the user base. It's with Meta and their business practices. People very simply do not trust Meta or Facebook and with good reason.