I work 2 days a week as a teacher at secondary. New timetables given out - I didn't recognise a code for one of my classes and asked the head of dept to find out what it was as she didn't know either. She found me in the corridor and said "I hope you don't collapse - it's an A level lesson! I said troublegum can't teach A level, she's never taught it before in her life, she wouldn't know where to begin! Hahaha! Don't worry, we'll swap it for year 10". She went on for a while in this way - she has a tendency to waffle.
This was in front of two colleagues, she laughed throughout as though this were a ridiculous idea. For reference, I've been at the school several years, haven't taught A level there - but I did do some A level teaching during my training and on supply before starting here. I don't mind not teaching it and haven't asked to - I'm so part time it wouldn't make sense. But I did study the subject to masters level, albeit a while ago now.
I just felt the laughing, and comments in front of colleagues, were so rude and not very professional. I feel my skills were really belittled and to be honest I had no idea how to respond. Not sure whether to leave it or tell her how bothered I am.