Met a woman at a mutual friend's houseparty and she contacted me to see if I wanted to meet up for coffee. Did so and got on quite well. Then went to see a film together, I was quite busy but made time although to be honest it wasn't really my taste in films, but appreciated she was being friendly and making an effort. So I've known her about six months.
We are friends on FB and she put a comment loosely relating to my field of work (think psychology-related). It was incorrect, so I commented, gently, so as to correct it. A male friend of hers then engaged with me directly, telling me I was wrong and suggesting some reading material (ie internet sites) where I could "learn about the subject". I reiterated my point and backed it up with written sources, etc.. He argued with this and I again corrected it. I thought I was fairly polite, considering I didn't know him, didn't engage him myself and he was a total arse.
Female friend must have been observing this, as after a couple of days she sent me a lengthy pm telling me she had deleted the thread. It was quite critical of me, telling me my sources were impossible to find, I was "harsh" and shouldn't criticise her friends or speak to them like that. It went on a bit in this vein. I ignored the pm but inwardly seethed and I let it go a while so the red mist wouldn't control my response. After 4 weeks, I sent her a pm saying that I had many good friends and none of them criticised me as much as she did, that there was nothing wrong with my knowledge of my own subject and she might want to apply her own judgemental criticism to herself at times. I invited her to defriend me. She has now done so.
Am I BU to find her judgemental? I actually think I'm quite good at taking criticism where its due but there was something about this that just wound me up. I feel bad because she went out of her way to make friends with me.