We wanted to watch a film so me my sister and her boyfriend were on the sofa (my other sister already went to another room because it was too much for her) and they just made out and whispered to each other the whole time. So I went to bed too.
My sister later came in asked me why I was sleeping already, and I told her the PDA made me uncomfortable. So she now basically thinks I called her a whore. We haven't talked since then.
Do you think it's rude to tell someone to tone down their PDA?