Forums should have separate layers for the object-level discussion, and meta-discussion. Then people can zoom into a peculiar grammatical detail that takes their fancy, but the main thread of a topic can keep going uninterrupted.

Then if a grammar discussion comes to a conclusion (as decided by the forum owner/editor-in-chief) it gets enforced on main threads thenceforth.

(my reply would go on the meta layer)

Polish forums were the same. You'd have someone make a spelling error and everyone would just disregard their argument.

Is this a very subtle "Grammar Nazi" joke or an actual thing that happens?