Stop for a minute, think about it, shrug your shoulders and start playing again

Consider his words deeply and play super abnoxiously.

So tell him you don't love him and keep playing. Or, get better at piano.

This is where you play his least favorite song to drive the point home.

maybe you tuned your brothers wrong key

I play flute and typically got threats from my brother. Still can't play unless he's not around.

I hope you played louder than before

So, do you love him?

Some people are producers and others are consumers. The consumers are really insecure, so they try to stop others from producing. Keep being a producer.

consider another instrument like maybe Banjos