My mother was a grammar Nazi. She grew up in England and emigrated to Australia. She had married my father who grew up in Australia. Every word had to be spoken in the queen's english. Pronunciation had to be correct. If it wasn't the way she was used to, she corrected us. For example the soil in the garden was soil not dirt. She loathed Australian slang, again more corrections.

Does grammar matter to me yes. Am I uptight about it? No.