AITA for not answering an unreasonable question?

So today I had my first day of work experience and I signed up with a friend. When I got home my mum asked me the usual questions of who I was with, however she has the tendency to ask a lot of questions, which is reasonable as I am starting something new.

She asks me who I was with and I answer with something along the lines of "X (my friend) and someone you don't know". They then asks me if they are of a certain nationality (not in an offensive way, it's just something she deems important to know about people).

I then respond with something along the lines of "What do you need to know that for? It's not important". Big mistake, she goes on a whole speech on how I have no respect for her and that she cooks for me does the laundry etc and I'm just ungrateful to not answer her specific questions about people she doesn't know/need to know.

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So, AITA?