Am I a bad brother for this?

my 11 year old sister asked me to get her a ipod touch for her birthday coming up,and that's fine with me but when she told me what songs shes putting like "Lollipop" and "My Humps" I disapproved.She got mad and asked why I wouldn't let her have it and I said because the songs were inappropriate for kids her age then she said "I hate you!" then she ran into her room and slammed the door