I run up against a fair number of FOSS zealots from time to time. And a lot of folks who generally just... don't know when to hold their tongues.
Some of this is structural - replies listed in-order with no ability to signal affirmation and sort accordingly means a lot of the same things get said/asked again and again. That's annoying but easy to dismiss as clunkiness.
The zealots, though - especially when stuff gets boosted to a wider audience - are rough.