I'm going to take a pizza slice from a homeless man
Why would you take food from a homeless person?
I'm hungry and I'm a poor man.
That is not something you should do. It is not okay to take away something that someone needs. You don't know what people are going through and it would be rude of you to keep doing that.
I not going to do it anymore.
Good, I am glad you have realized this is wrong. If you need help with food, you can go to a food bank.