I can't see how to define "accept" except as the opposite of rejection. You can understand what someone is trying to say, but then mock them for saying it "stupidly". You can also just refuse to repeat it. If you accept someone's usage, you probably do neither of these (you might make fun of someone for the heck of it, or not get a chance to use the new term, but you get the idea). Social dynamics, basically. And yes, this metric might produce different answers at different cultural strata.