I have an acquaintance that trained at an MMA gym for about a year, and really crap talks TKD. A couple friends and I take it at my university and he always trying to get them to quit. This is because "we are not equipped to defend ourselves." He frequently asks ridiculous questions such as, what if I have you in a choke hold on the ground what would you do? Or what happens if the guy attacking you takes you to the ground? The usual BJJ can beat anything guy. I let him talk, and never challenge him . I know that it won't be friendly. He'll be trying to hurt me , to prove something dumb. I don't really mess with people with big egos, they can be reckless and dangerous.