I use an app to play obnoxious music at random bars
Why do you play obnoxious music at random bars?
I like offending people by playing obnoxious music
You are bothering people on purpose and this is rude behavior. You are going to end up in a fight that you cannot win because people don't like being bothered.
Are you trying to deny me my freedom of expression?
No, but you are creating a noise nuisance and disregarding the law and  creating a disturbance for others. You will be fined and arrested for that behavior if you keep it up. If you want attention then find a positive way to gain it.