I was raised practicing Wado-Ryu Karate, dad teaches it and i also studied under his sensei (a hard ass old school Japanese master). I’m sure i’d lose a fight to anyone, i’m not that good. But people that take karate seriously wouldn’t normally walk around advertising the fact that they know martial arts, unless you’re traveling to or hosting a tournament or training.
May be different with other schools and martial art styles. Granted MMA is all about the promotion, and it’s meant to be more practical for real world defense. You do get a lot of clueless dbags that love MMA gear though, it’s like rocking an Ed Hardy shirt.