Ex Give 2 year old beer - how to approach in court

I have court coming up, which was filed by my ex. He files it out of anger because sometimes I keep my child at arms length with my ex and other times I do not. But I’m the last I had caught him a couple time letting our son sip his beer. I don’t know how many times he has done it when I am not around but when my son sees a beer bottle he wants it. My concern is my ex had an addictive personality, both with alcohol and sex. I don’t want my child to grow up with that same addictive personality and starting this young.

He asked for child support to be decreased and said I don’t let him see our son. He does spend time with him and actually with all of us. He also at times doesn’t want our son when I offer because he is at some parties or at a bar , sometimes working one of his 3 jobs. One of his jobs is managing a bar so he usually drinks at work too.

Right now his parenting is supervised with me since we last broke up when he was born. But now he wants I guess something consistent. I’m not ready for that yet. I rather wait until he is a little older before it become consistent because then he may get our son into a bad habit too. I don’t know what to tell the courts without getting him into so much trouble either. He broke my heart but I still love him and want him to have a relationship with our son but not on his terms because I think he needs to get help with the drinking.

Any advice how I can approach this or things I could say to the judge to look.m more logical ?

Update: As far as proof goes he always admits it. He claims he only gave him sips and doesn’t give him cups of beer. He said I’m trying to make him look like a bad parent which I don’t think he is a bad parent. I just think he has an alcohol addiction and our son should not have beer because obviously addiction can be passes if baby grow up with it. He doesn’t ever deny it. I do have a photo in which I caught him from the bathroom. He thought it was funny but I did not.