I find just being aware of my feelings is a great start to gain neutural ground. If you find yourself eccessively angry at someone or something, sit for a moment, close your eyes and concentrate on what the anger feels like, in a purely physical sense. As in, concentrate on the burning feeling in your chest, and ignore what is causing it. The feeling will go away the longer you concentrate on it, and you will find your mind clearer to think in a non biased manner. It works for me, as long as I can actually keep concentrating on the physical feeling instead of what is bothering me. Fun Fact: It also helps with wounds/bruises/etc.
One thing that just helps me be a nicer person in general, and I’m going to get 103 bullshits for this but whatever, is read a bible. Try it or not, believe it or not, I don’t give a shit. I’m just saying what works for me. I’m not saying study it like some sort of scolar writing down every law and name, just some light reading.