My mother is goading me into arguments -- I think. Any advice?

Lately I've begun to wonder if the arguments my mother and I get into are due to her baiting me. She will ask me to help find the shirt she wants. I find it and hand it to her. She say, "Oh, no, that's not it." In fact, she disagrees with everything I say. If I try to explain or say anything other than "you're right" the situation quickly escalates. I've learned to say nothing (OK, I'm still learning), but when I just walk away, she starts making snotty comments, talking to herself, etc. I think the only thing to do is quietly walk away, stay sweet to the person, and just ignore the behavior. Does anyone else think their LO is baiting them?