Of course this message comes off as rude. Some open source leaders have immense skill in being nice. Dan Ambramov and Matz (Ruby community's motto: Matz Is Nice And So We Are Nice) are positive examples of a high order.

I might have given up on learning FP without Evan's work on Elm. The Elm community when it was lively oozed niceness, and much of it was thanks to Evan setting a positive example. Yes there were flaws in Elm's leadership, even fatal flaws, but why revisit a message like this?

Maybe it's just an unfortunate example of how, with one message, betraying one's frustration can damage a reputation.