AITA for being mean?

So... the background: I'm 28 and my twin sister (Lisa) and I inherited a substantial amount from our grandfather. He passed away a year and a half ago.<br><br>The problem: my parents are very controlling and wanted us to put our inheritance in trust to use for college. They went absolutely ballistic when they found out we had both used some and bought cars. (we each saved 3/4 and split the remainder). We didn't do this lightly, but we'd discussed it and decided it was ok because we were putting the majority away. <br><br>Anyway they were pissed and told us to get jobs. I did, but I decided that since their opinion didn't count I would allow myself one more luxury; my apartment. It's way nicer than my old one and in a better neighborhood. <br><br>Lisa did not, she saved every penny because she was too afraid to make them angry.<br><br>Now the issue: our parents threw a party last week. We both went and I wore one of the new dresses I got. My mom approached and complimented me. I asked her if she recognized it and said yes. Then I asked how much she thought it was and she said $56. I laughed and said actually it was over $500. She got quiet and left.<br><br>My sister went up to me a little while later and said that mom and dad weren't happy. I said that wasn't my problem. Later my parents went out and said how hard it was to afford everything and my dad said he wish he could afford luxuries. I agreed and said how nice it would be if someone left him a large sum of money. He said that wasn't the point. I said that was the only point he made. He said I should be supporting my parents and I should give them money. I said they weren't entitled to it and to stop asking for it. He said my sister gave a little but he thought I should give more. <br><br>I blew up. I told him that they were the reason I have trust issues and that Lisa was a coward for giving them money! I told him that Lisa was stupid for giving him money. He said I was being mean and rude. I asked why he was so interested in what I was doing with my money.<br><br>Then my mom joined back in. She said that I was truly being horrible. I asked her why she cared. She said she didn't but that I was and I should be nice. I told her that it didn't count when she tried to control me using guilt.<br><br>I left the party right after but everyone is calling me saying that I was wrong. AITA?