Is he wrong for not letting his baby mom see her child?

My baby's Father ex contacted him earlier saying that He's wrong for letting me see their kid knowing I talked bad about her online. Then she said we're going to have "bad luck" for laughing at her not letting her see her child. She's mainly mad because I'm the one who gets to spend time with her son and not her. He told me She doesn't watch him anyways. Lol. Is he wrong for letting me babysit her child? She is the one who has the kid legally. She said he is not paying child support for their kid. She buy their kid everything including Food so she doesn't know why we're doing her dirty. It might be true because he never had money with me . I'm usually the one stuck with all of the bills.  Every time she message me about her child, I block her. Oh well! Her problem isnt my problem to be honest. 🙃