That's... Really really gross. And like a pretty inane response, too. Like, who cares? Are you saying dating X person makes you an expert on what it feels like to be Asian?
I'm sorry you've had to deal with this and I'm sorry this has been your experience on Mastodon.
Yikes. At most, dating someone who's Asian will give you insight into one particular person's life, and maybe their family structure. Not insight into the amalgam of different cultures, generations, immigrant or nonimmigrant experiences, and personal histories that "Asian" describes.
And yeah, "dated" as in, it didn't work out. So this tiny insight is the absolute most they would have learned.
Agreed, fuck that.