Pretty sad that they can't have fun playing x wing and think so little of themselves and there ability. Tournaments are fun and people go there to have fun. Yeah some people have fun winning, some people have fun flying certain ships and lists. If people think they won't fun I argue they're more worried about losing than having fun...
It's not that they don't have fun playing X-wing or don't think much of their ability. They don't like playing the other people that tend to go to tournaments with prize support (especially if they travel over 2 hours). They tend to be people who play with power lists and some can be rude. Why bother paying for an event playing lists they don't want to fly against with the possibility that your opponent is a jerk?
The jerk players are less of a case with X-wing, but there are other game systems where this is definitely the case.
Idk it sounds like the store isn't very open, accepting or friendly when they just assume everyone who comes in is a jark player and they don't want to play with them.