FFS that's so standard with all the tired angry and/or cocky personalities in casinos it should just roll right off. And like everyone's saying, use it to your advantage. I had this same guy sit next to me the last 3 days in different tourneys in a local series who was way worse than that.

One hand in a LIMIT O8 he gets rivered and his opp scoops. He says "nice call dumb**** chasing to the river with a gutter" and is literally almost in the guys face about it. Every hand after he ridicules the guys play over and over whenever he is involved. Then when he is winning he starts grinning and making jokes. 3 days of this and then I read your post and I'm thinking to myself..."I wish that was the worst behavior I've had to deal with"