I threw a cup in the air from the float during the parade
Really? Why would you throw a cup during a parade?!
I was confused and full of anger
You are being rude to other people by throwing things into the air during a parade. You are interfering with people's enjoyment of the parade and you are being disruptive and rude to others.
Do you get what I was trying to prove, no one cares since no one takes my side during that stupid parade.
That's because it was a parade and people were just there to have fun, you shouldn't have been throwing things during it. While you were upset and that's understandable sometimes, there is a time and a place for those sorts of things and it is definitely not meant to happen during a parade.