I think the issue is that the topic comes up quite often as seen by the author needing to create the gist. It easy to come across as a bit of "smug and obnoxious" when you explain something for the xth time.
I remember chatting with them years ago and they were pretty friendly. But yeah Lisp does have a specific culture and it can put people off thought I personally never encountered any bad apples.
If the argument was not born from ignorance I think it'd be fine ;) There's a rich history, decades old, of people claiming Lisp can't do X or is bad for Y, or is only a category and the true meaning of Lisp as a category is just having s-expression syntax. Some Lispers get more touchy when such things come up yet again. Attempts to correct misconceptions do work a little bit but just like bad and false popsci memes (remember when the "you only use 10% of your brain" myth was more popular?) the false memes seem to spread more easily. It takes a long time to overcome them, if ever.
I remember chatting with them years ago and they were pretty friendly. But yeah Lisp does have a specific culture and it can put people off thought I personally never encountered any bad apples.