Anti-Catholicism is a disease.
I think that an excessive concentration on why others are wrong is a sign of a disorder. A person who can’t be happy in believing what he believes is true, living the way he thinks is right, doing what he feels he is called to do, but instead must attack others, is a person with a problem.
If I went through life angry and upset that there are people in the world who don’t agree with me, I’m sure I’d be a total pain.
For the opposite approach, there’s G.K. Chesterton’s response to the question, “What’s wrong with the world?”: “I am.”