Open-minded

I always thought that I was open-minded. I like to travel, read a lot, like to hear different point of view... those characteristics are the ones who define open minded people, don't you think?

Recently, I discover a part of myself that I don't like. I'm less receptive when someone let me know his point of view. I'm not judging or anything but I found myself irritated. Not on all subject but in certain subject like education, family, values... Subjects that are important to me.

What's wrong with me...