It isn’t just slang; people often hate any sort of language change. Cue to the Appendix Probi, written in the fourth century; the whole list boils down to “write this, not that” because the new generations of the times were saying stuff like

vetulus non veclus [old man]
coqui non coci [cooked]
aqua non acqua [water]
auris non oricla [ear]

and writing it as such! (Those examples are specially fun once you look at the Romance languages.)