I know it can be frustrating to have your style, or the things you like challenged, or ridiculed, but you just gotta let it go. If you have a guest running a seminar, and they're opinion is different than yours, just ignore it. There's no need to challenge it, especially in front of the class. If it works for you, then keep doing it, and ignore anyone who says differently. It's just not worth getting worked up about imho. When people tell me they don't like the Seahawks, I don't argue with them. To each their own. I've had many folks comment on things that I do, good and bad. You can't let it bother you. You do what you want, you learn what you're interested in, evolve your style in a way that you enjoy, and who cares what anyone else thinks. That's my .02 cents anyway.