Wife humiliates nephew, I call her out, now she's mad at me. AITA?

Kids are a handful, but that doesn't excuse being cruel to them. A woman's nephew was singing along to his favorite movie when his aunt slammed her cup on the table and told him to shut up. The boy was heartbroken and ran off crying. His parents were understandably upset and left immediately. The woman's spouse called her out on her behavior, but she doubled down and insulted them too. Now they're wondering if they were wrong to mock them and not defend them. What do you think? Click the link to read the full story and cast your vote on who's the a**hole.