Oh sure, blame it on the Europeans; I'm sure we're oh so much worse than Americans as regards to bigotry in sports (it's also silly to generalize - Italy is completely different than France, for example, in this regard). I'm just going to ignore that ad hominem as it serves no purpose whatsoever.
Sure, people of color are accepted in some sports. Claiming that "just being good at what you do" is enough to break down entry barriers is beyond ridiculous. The fact that this is the first ever man to come out as gay before being drafted or while in the NFL alone should tell you something. People of color have had to fight their way into being accepted tooth and nail. Tiger Woods was the first ever black person to break through to the top of golfing. The number of black top tennis players is still incredibly slim (the Venus sisters notwithstanding). There are plenty of other sports where people of color are still completely absent - most notably most of the more "elite" sports and more "local" sports - polo, golf, tennis, darts, F1, swimming all equastrian sports, on one hand; darts, petanque, cyclocross, track racing, cycling, etc on the other other.
And that's looking at black people. They're more accepted in the "poorer" sports and the "more American" sports because, for A, they don't need much in the way of facilities and are more open to the poor (duh); for the other because quite literally every major American sports has "bigger is better" writen all over it (Football, hockey, basketball - less true for baseball), and specific ethnicities tend to be heavier/bigger built.
Anyway - you tell me how accepting your sports are, based just on performance...How many arabs are currently at the top in any of those sports? Oh, right, sorry, those ethnicities are still A-OK to discriminate against, because they're the current scape goats.