あ〜い、ちゅみまちぇ〜ん。

You idiot. If you don't like them, just ignore them.
They don't like you either,
that's why they are treating you that way (if what you are saying is true).

Or just because you are crazy and delusional (and racist obviously) you think they treat you badly.

Jeremy, do you need a new reusable shopping bag?

It sounds like more about Korean.
Maybe the people you are thinking of are Korean, but not Japanese.

> I really hate to make friends with any age Japanese people. They aren't open mind, tricky, unkind, cold heart and take advantage of others.

Then don’t make Japanese friends!