I DO think that context is all.
I don't mind people using the wrong words with me, but if I thought they were going to repeat the error elsewhere where it might count, I'd (tactfully, I hope) correct them.
Mrs jth is a bit of a Mrs Malaprop, so I'm used to it :o)
It's always nice to see the regular, sniffy 'puller-uppers' get their come-uppance on here, though....