I hate auto-correct because it doesn't stay in its lane. It tends to expect me to use the most common 10,000 or so words in English and will actually auto-bork totally valid words because it thinks it knows better than me.

I get whenever I'm using shorthand or weird acronyms or technical jargon that it might get confused, but when a word I type is both a) a real word and b) something I would use in every-day speech just leave it alone!