When Trixie was just a filly, her parents got into a massive fight and the young filly couldn't take it any longer. She was sick of them fighting all the time.
When she heard her mother being in trouble with her dad, she crawled out the window in fear and galloped away to Cantalot where she tried at get help, but nobody payed attention to her.
Read the short story of Filly Trixie and see if you can hate her so much after reading, everypony deserves to have their story told, and now is Trixie's hour.

Based on this comic;
http://i1.kym-cdn.com/photos/images/original/000/358/226/b15.png