Before my brothers and I were born, my mom had a child with an old boyfriend, "Penny". Her boyfriend/Penny's bio dad didn't stick around. My mom then met my dad when Penny was 3 and they got married. My dad adopted Penny. My mom then went on to have me and my brothers with our dad. Growing up, Penny was always the apple of my dad's eye. He gave us all attention, but he always went out of his way to make it equal. Around the time she entered her teens, Penny would make the joke "Dad was stuck with you guys, but he chose me", or refer to herself as "the chosen one". My brothers and parents always thought it was hilarious. I thought it was obnoxious. If our brothers and I were ever discussing what traits we got/didn't get from dad, Penny would break in with "I didn't get anything from him except his last name, because I'm the chosen one". Now, we're all adults, and Penny still trots that out from time to time. Recently, it came up when my siblings and I were out with our partners for drinks. One of my brothers has a newish girlfriend so she wasn't aware of Penny's store. Penny was telling it, shoving in that she's the "chosen one". I admit I was a little drunk and I said "Chosen by our dad, but you weren't chosen by your first dad, huh?" Penny got a hurt look on her face. My brothers told me that was uncalled for. Even the new girlfriend was looking at me like I was a douche. I said this story is just getting old. We've all heard it. And it's a little ridiculous. My boyfriend ended up calling us an Uber and getting me out of there. Well, of course word's gotten back to our parents and they're pissed at me, saying I was rude. I said Penny was just being obnoxious. AITA?