Yeah, I agree with nonightowl: they don't know what they're talking about really. If they had no response then, no, I wouldn't worry @StephenT. Sounds like they're doing it for 'fun' - which for me, if/when that happens, I never get the joke or why they'd even bother in the first place.

'Gaslighting' is basically when someone knowingly tries to make you think you're 'mad' or doing/saying something inappropriate when you're actually not. It can be confusing and annoying.