Look, nobody likes loud, obnoxious teenagers who have to make asses of themselves. Never have, never will. This is why you get embarrassed of how you were in high school, though I doubt you've reached that stage just yet. You used the way old people act as an excuse for her immaturity, but old people act that way because they're on the way out and have put their time in. The shitty ones act the way they do out of bitterness, the playful ones have the perspective of a long life and are enjoying the time they have left. These are both markedly different to the way elf acts, which is like a teenager BY DESIGN. If they had made her 100 or whatever, there could be an argument for elves maturing slowly, but there isn't much excuse for acting like a kid in the throes of puberty when your age is measured in millennia.