Okay both of them were in the wrong here. The victim pretend to be her sister to date this dude. With in modern world, would be catfishing. If the person who you wanted to date, actually is another. It's understandable. However, his behaviour towards her looks and personality was trash. He had not right to jugde her appearence or her in general. He could just have said :" girl wtf, why would you do that?. I don't want to date you" but pushing her and killing her?