It was a response specifically to the original post. I think it's reasonable to assume that someone coming late to a thread might not have gone through 20-something pages of discussion, arguments and tangents.
Perhaps badwrongfun is the wrong term, but the tone of the original post strikes me as a combination of exasperated, mocking and also slightly disdainful. Tone on the internet is a tricky thing though and we all bring our own baggage to it.
And, while it can feel like a condescending response to a question, "Relax and try it out" can be legitimately useful advice for a person who seems exasperated by something.
Again, if you're coming into a thread days late and more than 500 posts short, maybe do a bare minimum of skimming?
And I think that you are the one reading into it- should I say that you are engaging in badwrongfun and being intolerant because you are incorrectly saying that the OP is "disdainful?" No? Is there, perhaps, a reason you have spent several posts defending a "condescending response" while at the same time attacking a good-faith question?
People are a little too eager to toss around the "gatekeeper" and "badwrongfun" in order to shut down other people. Not everyone will have the same opinions, or run game the same way; and that's fine! But we should encourage, not disparage, people that are asking about things that they don't understand, or aren't familiar with.