His argument for why he dislikes Go and Javascript is ostensibly "they are easy to grok"...
I don't think this presentation was made out of ill-will or spite, but I think this presentation leaves little room for the mediocre; and frankly if a field is devoid of mediocre performers, you end up with a handful of gray-beards in a code cloister.
This is where, I think, the programmer mentality and the human empathy understanding are out of balance, and lead to false truths about how humans ought to behave.
I sorta like his point about contributing upstream, but again, I think that he neglects the fact that that isn't a straight-forward process to someone new to a language. He brings up that "the Rust community is welcoming", but (a) that doesn't really apply to most communities and (b) especially when you're just starting and haven't had too much exposure, you probably haven't witnessed (or realise you have witnessed) a bug in the 4 (often mature) standard libraries you regularly use.