I'm rude?

I was called 'rude' three times today at work, once by Pompous Ponce, once by New Girl and once by Girlfriend of Tall Colleague. PP quite often insults people, so I've learnt to ignore him. However, this is the first time the NG and GoTC have. Granted, they did it in a joking manner, but this bothers me a bit because I'm pretty sure I didn't do anything that could be considered rude. I think part of the reason is because of the bitchy and other incidents that happened in March with different colleagues.

Should I ask them what they were on about, or let it drop?