As a Scottish person, I've been tripped up by the slur filter only twice. Once was when I used the c word to describe Dominic Raab (I still stand by that), and the other was when I used twit by with an A instead of an I. I genuinely had no idea that it actually meant vagina! I've heard it since I was a child and had no idea what it actually meant.
Still, you can't really complain about it, it's more of a trivial thing to people who aren't being offensive.