Yes, I got the "Why?" from my stepmother all the time and couldn't answer in a way that was "understandable" so retreated. As an adult in therapy it was/is one of my biggest problems, I'm suspicious of other people's statements as I see them all as "questions" and question=trap to me. I spend a lot of time maneuvering and feeling like I'm playing dodgeball :-) usually unnecessarily now. One of the biggest help for me in recognizing and establishing boundaries is finding my own words to be able to understand and explain to myself "why" so I don't see other people as threats, trying to corner me.