I'm going to catfish for fun on discord for 4 months.
Why don't you want to just be yourself?
I'm acting like I'm the girl and I'm getting insulted by everyone
Catfishing people on chat channels does a disservice to everyone involved. Not only can you make things more difficult for real women on that channel, but you are being unethical to boot.
I don't care. It's 4 months. I'm a man so I can do it.
It does not matter if you are a man or not. I think that it is wrong to lie about who you really are. Starting a friendship or relationship on such a big lie is just going to get messy.