There have been times when I have called her out on what she says and it just makes it more awkward. Fore her? Good it should
For you? Why. All you have done is point out how rude she has been.
Do it more often, until it feel natural.
Have some ready made sentences up your sleeve ready to go.
"imagine being married to that". = indeed, just imagine... nonsensical really but insinuates so much
That is sad = Don't worry you'll soon cheer up again, deliberately misunderstanding and daft
any other comments = Ooh, how nice / cheer up sunshine
Or my personal favourite, I may have oversued it
Look at your watch and say cheefully Oooh! Is it Friday already?
My snarky colleague was driven bats with my deliberate non sequiteurs. It took months to manage, but it did become second nature and, best of all, other colleagues could instantly compare and contrast our general demeanour every time it happened.