I am not a talmid chochom and I do not know whether a sports bar is halachically permissible in every respect or not.
However, I do know people who enjoy watching the games and manage to do so without a “kosher” sports bar. I’d like to propose that they are better off watching the game however they did so til now as opposed to an entire frum community (including impressionable children) becoming desensitized to the following idea – namely that it is a normal, accepted and kosher thing for a man who has a chiyuv talmid Torah to while a way his time socializing with both genders in a bar setting watching a sports game.
Never mind the people who would have never thought of patronizing such a place, but because it’s so accessible they begin to do so, to their OWN dissatisfaction.