That and that I didn't have rights. It's my hearing aid, my body and therefore it's my right to offer others to look and see, not my mother's. So, if she asked me if I minded, I felt compelled to say no specifically because we were in front of others and I was brought up to be a nice girl who always showed respect to her parents and someone who didn't make scenes in public.
I just thought "ok, this is one time. Not going to make a big deal out of it" but when she did it again, then it was like "ok, that's enough, thank you very much."