Would you let your childs father terminate his parental rights if he wanted to?

My sons father visits with my son every other weeked and on Wednesdays. He never asks to see him extra. He remarried and has another child. He does not include my son in family vacations, when he got married, holidays, etc. My son says when he has his visits they ignore him most of the time he is there and always tell him to play with his little brother who is 9 years younger than him. My son says he & his wife have no interaction with him when he's there. Wednesday he told his Dad how he feels that he is not a good Dad and that he never does anything with him. His father got very angry and told him he is a good dad because he always picks him up, and made him stay in his room the entire visit, when my husband picked him up his dad didn't tell him good bye and just slammed the door. Today I received a phone call from an attorney, my ex wants to terminate his parental rights for my son and wants to know if I will agree. I'm in shock and don't know what to do. My son has told me before he wishes that wasn't his dad because he is uninvolved in his life. He also is very close with my husband. I just can't believe he would even consider doing that instead of trying to work on their relationship.