Don't really want to rush to judgment here as this could be their livelihood. The owner may well be a Kings fan but the place may have been a Chicago transport hangout because of managers or something and the owner was ok with it all in good nature. Or maybe the guy is just lying now to try and do damage control. No idea since I've never been there and never met the guy.
If it's the former I feel bad for the owner and if I were him I would fire whoever let that video play (especially if it was on a loop) and if it really hurts business badly, possibly sue the idiot that put that on there. If it's the latter then I could care less if the place goes out of business from making such a bonehead move. It's fine for him to be a Hawks fan and hate the Kings, but knowingly putting up profane clip like that in the name of bad sportsmanship in the middle of enemy territory is monumentally stupid.