I've seen that thread before but just read it through in its entirety. All I got from it was "OpenBSD people are assholes, and not in the Torvalds 'constructive asshole' way, just in the 'being an asshole for the sake of being an asshole' way".
There is few strong words here and there, but nothing more injurious than what you would hear by staying in a school for 5 minutes. Once you understand the liking of such words by their writers, it's easy to mentally replace them by more politically correct version if it bother you. Moreover, they just critize tech, not people and that's an important distinction imo.
The big problem with that thread isn't profanity or insults or tone. It's that the developers are repeatedly refusing to provide any detail or justification for their less-than-polite assertions that failed to answer the question. Some degree of insults and profanity can be tolerated if there's also useful content, but Henning Brauer and Theo de Raadt didn't make any useful contributions to that thread.
Sorry. No. There's no "political correctness" at here
Theo's comments in particular seem to start at
"NFSv4 is a gigantic joke on everyone."
This isn't politically incorrect, it's just noise. Nothing is gained from this comment. Even Linus with his infamous "rants" would have actual commentary laced in, Theo is just being dismissive
After someone reaffirms that they would like to use it, he replies
"Hahahahaha. That's a good one."
"I guess by "all the other protocols" you must be rejecting all the rest
of your network traffic as "not protocols" or "not services"."
Well, to be fair there was at least one poster who suggested that OP use SFTP instead of NFS... I mean why bother with a vegetable peeler when you could use a chisel instead?
So yeah, like you said--absolutely no useful information was conveyed in that thread. Besides any lurking bystanders learning those "in the group" are complete assholes.