I was not in Orlando, maybe because an European distributor banned the foreign players from the main prizes at their qualifier, ... but it's another story (?!)
There are stupid people everywhere, people who think they're better than the others, that they are superior for one reason or another, people who will never admit that someone can better than them.
But I'm sure it's a minority.
I remember tournaments in Holland, Spain or England where my daughter has won STS qualifiers ... without any negative or aggressive word from the players of these countries.
I remember San Diego when Jean Marc Schosse, from Belgium, won the STS. Players from a lot of different countries came to congratulate him, at the event and later at the hotel.
I remember Hawaii and the Japanese players at the TMB 2002. They were not really good at that tournament, but all of them was very friendly and we've had a wonderful time all together, Japanese, US and Belgian players.
They've taken a lot of top 8 spots in Orlando ? They were simply better than the other players.
Instead of having a negative behavior, the losers should better remember that you can learn a lot when you lose, and that a defeat is always positive if you learn from it to be better next time.
Sure there are stupid people, people who don't accept or want to take the risk to see foreign players beat them or their friends. People who think the only 'good' people live in the same country, have the same religion, language or color of skin as them. But I keep on saying it's a minority.
I do completely agree with you mom, and the poor foreigner that I am would like to say that US people should never forget that, 200 years ago, their country has been built by people from a lot of different origins, cultures and religions. 200 years ... not really far from us, no ?