No it's not. Sometimes (or maybe most of the time) doing it badly means maybe it's not your thing.
I used to have a neighbour who liked to play the piano and sing. He was doing it consistently badly and he didn't have anyone to tell him that he should probably stop trying.
To your neighbor, doing it badly is still doing the thing.
Doing the thing isn't about judging other people. That doesn't contribute to your thing.
If someone is bothering you, making it hard to do your thing, then your thing involves talking to them about your problem. Without judging what they are doing.
the answer isnt to stop practicing, its to practice the right thing and not practice doing it wrong.
theyre probably still better off playing badly and enjoying it, vs just staring at an unplayed piano though