I have the urge to tell someone his mohawk look like a parrot.
Why did you tell him his mohawk looked like a parrot?
Because I hate birds and I wanted to insult him.
Making fun of that person's mohawk was very rude. If you don't like someone's hair you should keep your opinion to yourself because telling them will probably make them feel bad.
I don't care. I get a petty sense of pleasure when I troll people.
I understand you get pleasure from doing this, you need to understand that doing this is childish. I'd recommend stop with the trolling and learn to be more accepting of how people look.