Then that's actually quite understandable and what I'd normally expect. That isn't toxic and isn't harassment. If you're going into content meant for 385, then having 290/300 gear is very unacceptable.
And it actually does help to illustrate my point. In NA servers, the likely scenario would be some jerkish comment and maybe some arguing before the person is eventually kicked. In JP servers, they skip the toxic comments and just go straight to the kicking (or tolerating and then blacklisting depending on severity of the "crime").