A lecturer for a course I am attending was late for a class, and as they had sent an e-mail a few days before mentioning a different classroom, the class was confused about whether we should go to this classroom or not. I decided to send the lecturer an e-mail to clarify whether the class location had changed.
In the end, the lecturer appeared about ten minutes late. That could've been the end of the story, but the lecturer sent an e-mail today (to me only) stating that I "was the only one confused [about the matter]!". I find this rude and inappropriate - they could have just let it slide, or at least apologised for being late.
I realise that I caused some minor noise in their inbox through my e-mail - but it is not enough, in my opinion, to respond rudely.
My University is running a campaign on respect among students and teachers. I would like to respond in a way that clarifies that I think they were rude, while keeping in mind that I will have the class for the rest of the semester with this lecturer.
Should I respond - in that case, how? - , or should I simply ignore it?