Is OTHER wrong in the post ? POST : 
Scenario I'm referring to: 

All three of us were in the kitchen while I was making dinner, and my bf took a plastic bag and put it over his(own) head, and proceeded to pretend he couldn't breathe. My son thought it was hilarious. I took a moment to explain to my child that this is something you should NEVER do, etc., then sent him upstairs to play. I said to my bf that I didn't appreciate that, and he should know it, and said he needed to have more regard for what he does around such an impressionable mind. He became incredulous and stated that he doesn't do inappropriate things in front of the child, so I mentioned his little jokes that aren't age-appropriate and his cursing. He stated that he thinks it doesn't matter if you drop gratuitous f-bombs around a child, as long as you teach them that it isn't okay to repeat them. I just want to avoid to headache until he's older and will understand social boundaries better. This ended with "I'm going to curse in front of him, whether you like it or not." I'm, like, stupid mad. Does that make me an asshole? 

Background: I have been with this man for all but 6 months of my son's life. We have plans to get married. He's great at teaching my son things, and very calm and level-headed with him. His sense of humor is inappropriate for a child, in my opinion, but he's a good person. 