I think I know what happened with my demibeast Robbie in his childhood that <i>destroyed</i> performing for him. o:
He idolized a professional violinist as a kiddo, mimicking their energy and their choreography across their performance venues when he would practice at home. Mom would tell him to be careful as he danced and spun around with his violin in arm, but she thought it was adorable.
It happened after a recital, to which his mom (maybe also his dad? I dunno if his dad is still around) had invited some of the extended family. His teacher allowed him to move around a little, but nothing like he was allowed to do at home, just for the safety of himself and others. He played beautifully for his skill level, and was absolutely beaming afterward when he met up with his family. His mom gave him a big hug and told him he did so well, and one of the uncles asked him what he was going to do with his musical skills in the future.
"I'm gonna be a puhfesh'nal and do concehrts and travel like my fav'rit violinist!" he crowed, handing his mom his case and dancing around like his idol while Mom just smiled and watched him. In chimes the wife of one of his favored uncles: <i>"What a ridiculous idea. You'll never do well doing something silly like that."</i>
Robbie's dancing stopped, and the shining smile melted from his face. Mom's face was a twisted mask of rage, incredulity, and silent "How dare you?!" The horrified uncle looked at Robbie and his mom with the expression and posture of a beaten dog, apologized quietly, and left with his wife.
The ride home was silent, Robbie staring sadly out the window and trying not to cry and trigger his shapeshift. Mom tried to encourage conversation, but he replied rarely and with single words at most. She resigned to helping him keep control over his transformation until they were home and he could get out of his recital outfit. He ran to his room and closed the door, and with a sigh his mom set his violin by the couch. With vehement purpose she took her phone from her pocket and called her brother - Robbie's favored uncle - and demanded to speak to his wife.
In his room, a furry little Robert lay curled up under his covers, his transformed ears better able to hear his mom yelling on the phone. As protective as she intended to be, the damage was already done. He wouldn't play for anyone again, not even those who had supported his dream so wholeheartedly.