School Ties (1992)

Brendan Fraser is Jewish and pretends not to be in order to go to boarding school. He dates some cute girl who, when she finds out he's Jewish, slaps him. It is not impossible that Philip Seymour Hoffman is in this movie, too, probably as a friend who turns on him or just a rival who's delighted by the information. I feel like this is the kind of movie that ends with our hero's being expelled but with people's feelings having been affected, spelling hope for the future. (But mainly what I remember is his getting slapped by a girl for being Jewish.)

This movie might be a little gay (and/or homophobic: these are probably the bad guys).