Anyway, this kind of experience report would be totally unsuitable for ICER, which is the venue focused on true CS Ed research. This might have a life at SIGCSE, but why go and preach to the choir? And honestly, I don't think it really does merit the level of research publication. This is just a blog post level argument.
I did outline why this site exists. And I do think that this is worth sharing on here, if only because this site drives me nuts sometimes with all its arm chair CS Ed researchers. If I only persuaded a few folks to stop citing HtDP as god's own truth, and to approach that community more critically - I would say that is helpful. Hacker News folks need to understand that education is a heck of a lot more complicated than they probably think it is, and their experiences probably aren't generalized.
I also think that the Racket education community is dying out. For good or bad, I don't think I really have to start publishing research to try and speed it up. But I think that having these reasons and arguments recorded, and written publicly, is a good thing. I am trying to keep in mind, as I write, that some day someone may write some blog posts for "ihateblockpy.com" or "ihatecorgis.com" (my research projects). Perhaps I'll be eating my own words!
You say this is important to communicate, and it seems pretty central to your professional field, so I don't understand why you aren't using what I assumed were the mechanisms of that field.
As you said, HN overall probably doesn't understand your field, and, given that: do you think it would be good practice for HN to let its impression of a field be determined by a punchy domain name that bypasses the field's own review? (I assume your thoughts are much better than those of anti-vaxxers and climate change deniers who bypass the field.)
Separate from that, since you think someone has been rude, maybe approach them constructively about it? All of you are just people, who spend your days teaching students, and researching that.