I’ve unfollowed several people on FB for the reasons you’ve mentioned. I have no intention of telling them I’ve unfollowed. They may or may not notice.
Supposedly they can’t tell they’ve been unfollowed.
I’ve unfollowed many and never heard a thing about it.
I make them unfriend me by calling them on their BS.
Facebook perhaps has its uses, but “friendly” discourse is not one of them. There is no anonymity on Facebook, and people who are careless about what they put up there may find themselves subject to a lot of abuse they could just as well have done without.
Maybe videos of cats caught in predicaments IS the highest and best use of Facebook. But just about everything else either has to be kept bland and uncontroversial, or is best limited to just saying “Hi”, or passing along innocuous jokes.
And you can get burned on those, too.