Your DD is 11 already and I’m sure she would be asked at a family court what she feels about a 50/50 split of weekends. She might then, instead of responding honestly, respond to please her dad or at least not to hurt him….or to please you, putting aside what she really wants.
So I would talk to her about this and take time to find out what she really feels about 50/50 weekends. Her honest answer might be that she would like to try it out for one weekend a month or that she is adamant she doesn’t want to go, or that she wishes she could have more fun times with him. Only she knows.
In order to get an honest answer, you shouldn’t show her your prejudice against him, as you have on here …let her know that while you will always protect her wishes, you won’t ever be hurt if she chooses to spend time with her dad.
You would be better off in the long term working this out with her and her dad, out of court if possible so that your dd’s wishes can be truly represented in the decision making.
I personally think a 50/50 split of time with each parent can often become so miserable for the child who is constantly on the move, never settled, always missing out on something the other family has to offer, missing out on friendships, and having to negotiate each parent’s hurt feelings.
But I know a lot of mums on here says it works just fine for them.
It’s what works for the child that should be considered as most important. It helps the child if the parents can be seen to discuss and agree without rancour.