Is it wrong to hate the mother of your children?

Angelogage: At this late stage in life I am raising a child who's mother never paid a dime in child support, who has not seen either of her children in over a year and a half, and who has only called once, when her boyfriend/father of this child dumped her once again and that was to cry to the child about it...I don't say anything negative at all about his mother and don't focus on the money. He has enough of a burden to carry without adults in his life talking trash about her.