So it's o.k. to bash someone for being young and stupid? It's o.k. to laugh at everything they do? Because someone is young and stupid means it's perfectly acceptable to criticize every move?
I'm not a Brittany fan. I don't care for her music or her style as an entertainer. However, as I don't know the girl personally I won't comment on her life except to say that I feel sorry for her--not only is she young and stupid, but she's young, stupid, and in the public eye.
Fortunately, she'll grow up one day. We were all young and stupid at one time in our lives. Usually late teens / early twenties. One day, she'll look back (as we all do) and say "Oh my goodness. WHAT was I thinking?"