Yeah anti Japanese would bother me as well if I caught it as I'm an anime and Jpop/Jrock fan as well. If Kpop artists wanted to encourage me as a fan they would develop positive rather than negative relationships with their Jpop counterparts.
As for Kpop all sounding alike how is that different than say American pop?
If you have the money to buy a Tesla I don't think you're someone who cares what people think one way or the other. You don't need to care about public opinion with that kind of income.