It's COULDN'T care less. Implying you give no fucks, and can' give a negative amount of fucks, so it's impossible to give any less.... but other people could care less about us restricting ...
Usually when you correct someone's grammar on the internet, a bunch of randos who aren't even remotely related to OP will get mad and offended for some reason.The solution to a fuckton of people being wrong is not to just let them be wrong, it's to correct them.