Yayaya isn't racist at all. They are not acting out a racial stereotype, but a cultural stereotype. Tbh I think anyone should be okay with parodies on their cultural background, hell I think you should be okay with any parody of anything you do. However with the bubble sisters its different, because they are trying to parody being black, which is not something you do, but something you are. Although I'm pretty sure it's more appreciation than negative racism, so you shouldn't get too offended. Imo with all these things its the same, you shouldn't think of it as a problem because thinking of it as a problem makes it into a problem, even if it wasn't.
Those sex scandals sort of disturb me btw, its said to be an 'open secret', but yeah.. with that girl killing herself etc. sounds pretty messed up. I sure hope not too many girls were affected in the biz. The worst part is that I realize my initial reaction is 'I really hope snsd/I hope the mainstream artists I like didn't have to do that.' but of course its just as bad if any other girl was forced against her will to do this, and the lesser known artists are probably a much easier target and thus it probably occurs a lot more with them... and they don't get much in return either.