Although 'retard' in undoubtedly a jeuvenile insult, I suspect it's overuse in the US makes it less insulting than if it was used by civilised european types...
As the chap is in the privacy of his own home, and is in 'full combat mode' with 26 tables going, judging his character on that short clip is a bit harsh in my opinion.
You are probably right Donkey - but Tank & I are just sparring. He's a Scot, you know.