Did I overreact?

[ShoriKid]

Definitely talk to the others to see if they will talk to you instructor with you so it is the entire group that was involved there in the conversation. This way is doesn't sound like you're training to out this guys for personal reasons.

This is a good thing to do. It never hurts to present a full accounting from multiple people.

I would hate to say what would happen if someone came into my dojo and pulled a stunt like this because in some ways we are still very old school.

You had better not do anything rash....without me! We sort of had someone try to step in on our dojo when we were at our old location. I wasted a class talking to the guy outside of the front door. Never invited him in. He was dropping hints about all of his rank and experience and how much he could show us. Gave off a bad vibe and didn't want him stepping foot on our floor.

[Groinstrike]

no overreaction at all, guy in obviously an egomaniac. I try not to train with people like that.