AITA for taking back the coffee my son had "treated"?

I have a 16 yoa son who's not really close to his dad and I (42) because his dad (my ex) and I have very different personalities. We grew up in different environments and I think this is what led to our divorce when my son was 8. My ex got divorced and remarried, while my new wife (now ex) and I have a 19 yoa daughter. The divorce was amicable and both me and my ex have good relationships with both kids. My daughter is closer to her father because she has a similar personality to him, while my son is closer to me, or at least he was until recently.<br><br>I recently learned about a new brand of cold brew coffee that my daughter and I love. We would regularly buy it, but it's hard to find and the stores where we can buy it are a 45 minute drive away. My daughter and I decided to try and make it at home, so I bought the materials to do this and we had a lot of left over grounds that we wanted to use. I asked a couple of people on social media (Chambers, Instagram) for suggestions on how to use the remaining grounds and one of the suggestions was to freeze it in an ice cube tray. I really liked this idea because you could take out as many cubes as you wanted and steep them in water/milk to make the exact strength of the coffee that you preferred. We tried this and it worked perfectly. My daughter suggested that we sell this online and I said I wasn't comfortable with that. I thought this was the end of the matter, but my son heard our conversation and asked if he could try some. He liked it and asked if we could start making a regular batch of it for him to drink at home and I said yes. The reason I said yes is that I was going to keep making a batch for me and my daughter to drink too. <br><br>A couple of days ago, I was in the kitchen and my son came out of his room and took the container of our coffee from the freezer without asking me if he could use some. He left the room and I asked him if he needed something and he said he needed some of the "coffee ice cubes" and didn't wait for a response, just took the container and left again. I decided to stop making my batch that night because it really bothered me that he was taking it without asking. The next night I was going to make a batch but didn't and the night after that I didn't make a batch again. My daughter asked me why I wasn't making a batch anymore and I told her what had happened a couple of days earlier. She told me that I was being dramatic over something small, but I think it's disrespectful to just take someone else's thing without asking and not even waiting for a response. My son is still making his cup in the morning and he even offered to share, but it's not the same because now I have to await his request every morning so that I can drink it. <br><br>My daughter is very upset that I'm no longer drinking the cold brew and is calling me an AH for not making it anymore. I miss drinking it, but I'm not going back to making it for myself until my son is willing to ask and not just take it. Am I an AH for taking my coffee back?