In the name of Allah, the Merciful to all, the Compassionate
I am not psychologist, but I have seen enough psychos in my life, from benign ones to the ultimate vicious. For me, the most annoying people were the ones who get used to doing something wrong, while they preach others not to do that. For example some people cruelly tease others, but if you return their favor, they get mad and preach you about how insulting it is to tease others. I have even seen more severe cases who are addicted on doing something wrong, while preaching totally innocent others not to do that wrong.