Lol, was the Bulgarian lady as good-looking as Sharapova? If she was, you might not have minded the hissing so much.
I think you are right about chess players in general, though I love the games of Paul Morphy, and from what I have read, he was a perfect gentleman.
When Morphy toured Europe, he found the players over there to be a rather mean and vain bunch, with the exception of Adolf Anderssen, who was a very good sport. When someone remarked to Anderssen that he was not playing up to his usual brilliance, he replied, "No, Morphy won't let me!"