I like to roll down my window when approaching a homeless person on a street corner then immediately roll it up again when I get there.
I hope you are joking, how do you think other people will react to you treating the homeless that way?
I think many would consider me rude or disrespectful.
Your behavior to the homeless is rude and it is not okay to be rude to homeless people. If you don't want to give to the homeless then you should ignore them and keep to yourself.
So? I'm going to do my own thing anyway.
You may think that way but it is still rude to act that way towards homeless people. Think about how you would want to be treated if you were in that situation. You should try and change how you feel.