I know how staged validation lines can be condescending but one that DB coach suggested when spouse says something unfair and you are unprepared to react is.
" I don't know how to respond to that"
Hopefully conversation will be focused on kids and wrestling.
Just remember what a great dad you are! Right now it's really about those kids and you are doing a wonderful thing by staying in their lives. No matter what, this is something you will always be appreciated for.