Re: Don’t waste your time practicing AIKIDO
You can always reply with the argument:
"You're training for competition in which there are rules, so you are actually training not to use full force or power when punching and kicking. I hope this doesn't come back to hurt you in a fight when you 'punch' someone and give them a little tap for the 'point'.
I train in something where there is very little competition because it is too dangerous not to know what your opponent is doing...after all, if we killed all our training partners then where would we be?"
...or you could just smile because you know something they don't and let them keep shoving square pegs into round holes.