I think we agree with each other. Words like "ain't" entering the common lexicon (usually in spoken english) is fine by me ie. Words formed out of contractions of other words/phrases, or entirely new inventions.
What I mostly get riled up about are words or phrases that are just plain wrong, but that have been used so widely that some dictionaries have accepted them as correct.
"Enormity" is one of those words. It used to be strictly "horrible," conveying a sense of wickedness, and to use it as a synonym for "enormousness" was glaringly wrong. But the mistake was so common, even among journalists and writers, that that it has gained acceptance in at least one English dictionary.
What I mostly get riled up about are words or phrases that are just plain wrong, but that have been used so widely that some dictionaries have accepted them as correct.
Eg: https://www.youtube.com/watch?v=om7O0MFkmpw