"usage changes" which have been around since long before you were born. Are there other long-established regionalisms/dialects you have a bug up your butt about?

It might be pragmatic to care about the judgment of one's ignorant elders, when the ignorant have power over you, but in no other sense should one care about such opinions.

The first person to write "should of" and "could of" instead of "should've" and "could've" was certainly incorrect, because they misheard someone's speech and wrote it out phonetically in a way that no one had ever done before. At what point does the incorrect usage become so popular that we ignorant fools start teaching "should of" and "could of" as correct English to our kids?