There are more white foreigners doing things you'd be ashamed of than there are bisexual people doing things you'd be ashamed of? I think it has something to do too with one of those being construed as a position of privilege (even if you don't experience privilege associated with it) and the other one definitely not being a position of privilege. IDK, that might be totally wrong. It makes sense that you'd feel shame about being a white foreigner but not about being bisexual, I guess.