A.C.
If his father really said that he is just being a jerk. Even if you were filling that bottle with Coca-Cola, you'd be hard pressed to find a judge that would do anything besides maybe sending you to a parenting class.
I breastfed until 18 months (and would have nursed her longer) and my daughter stopped taking a bottle at a year BUT she was still nursing and wanted the pacifier again (which she had given up before 9 months). Suckling is very soothing for babies. Maybe try a soft-spout sippy cup? Some of them are barely not bottles. My daughter is 3.5 and is still very comforted by sucking on something.
That being said, your son is old enough to 1) really notice the tension between you...that has to stop and 2) find another way to soothe. Don't be fooled--he is old enough to understand how to manipulate the situation around him to get what he wants. I think you know already that giving in was one of the worst things you could have done. I am not saying that you shouldn't comfort him, but the fact that he "demanded" the bottle and you gave it to him is a bit of a nightmare at this age.
Things have cooled off between my ex and I, but I still make it a point of never discussing "business" in front of my daughter. You and your ex might want to consider the same thing.
Even if the new wife isn't a mother, you can bet that some of your ex's opinions are being colored by her input. I am sure she has some strong opinions about what you're doing right and wrong--until she has her own, she won't understand that very little is black and white when it comes to kids.
Consider only giving him water in the bottle...and maybe going back to a stage 1 nipple. It make it too much trouble to get something that he doesn't particularly want.