It is unjustifiably mean spirited to Julia programmers in general. I admit that it is an unfair characterization of everyone who programs in trendy languages. I just got irritated that he commented with pure snark to what looks like an amazing paper. And I find being witty and mean instead of blandly authoritarian is the best way to handle those people.

Anyone who wants to learn, great. Anyone who wants a one-sentence snark, I'm not going to be as open to helping out.