Stu used to stick his tongue out while he was concentrating just like Bret does. Stu would do it when he was sinching down on a hold in the ring as well.
It would be kind of a letdown to dry for hours just to meet this guy. Typically at a meet and greet you want to have a nice experience and a connection with someone but I don't see that happening with him...
unless Bret is telling a story he seems to be a man of few words. also conventions can go on for many hours and I'm sure they get burned out at some point