I want to embarrass some random lady who made assumptions
Seriously? Why would you want to embarrass her?
I don't like it when people make assumptions thinking that they know everything about other people.
I understand why you would be upset if she made assumptions. People shouldn't make assumptions of others or they will look stupid when they are proven wrong.
I was just kidding, chill out.
Well it is good if you were just joking, I am glad that you don't have any issues. It would have been completely valid for you to be upset about someone making assumptions, though.