It's a feeling most of us here know well WB. For a long time even when she was still living with us, W acted the same way. I would say something light, not important and it would immediately set her off. She would get frustrated and say "I know that" or would cut me off all bugged saying "You don't have to explain it to me, I get it". It was way she would NEVER act around anyone else! Even people she dislikes she at least acts nice. But with me she just couldn't seem to stand me being around!

Just wanted to let you know, you are NOT alone!