For bitching about language pedantry, other posters' language, and language in general

Correct, but that’s not because of dictionaries and usage guides. Prescriptivists have cause and effect backwards.

Communities define their speech through speaking. Authorities determining what’s correct or not are completely unnecessary. If someone doesn’t follow the usage of a community, then they will not be understood by that community. And descriptivists record what the usage is for the community they’re studying.

Communities define their clothing through wearing clothes. Authorities determining what’s correct or not are completely unnecessary. If someone doesn’t follow the styles of a community, then they will not be dressed like someone of that community. And anthropologists record what clothing is worn by the community they’re studying.