Yeah, ignore and give your daughter some things she can do 1. ignore 2. "Dad, I really do not like when you talk about mom like that"
Keep inviting him to her activities, send him a copy of her sport's schedule with her to give to him. She is old enough to start seeing it. It is getting to the point where the two of them need to make a relationship as in a few years she will be 18.
Biggest thing we do is LAUGH....when she says stuff, just laugh and say don't worry about it, one day he will get over me. LOL