I personally witnessed him be very rude to a customer at Blade about 3-4 years ago. Uncomfortably rude, totally uncalled for. It was my 1st Blade Show, I just happened to be in his booth looking at his stuff, and I couldn't believe it.
I witnessed the owner of SOE (John...something.) be a total jackass to an older man last year. He was waaaaay out of line. I bought a belt from them right before it happened and I wished I hadn't bought it.
I'll remember this guy you are talking about and make a point to keep walking if I see his booth.