AITA for taking back the coffee my son brought me and throwing it out?

I (42m) have been married to my wife (39f) for over 12 years and father to our two sons (7m) and (16m). Due to a family falling out when I was in my early 20s I have not seen or spoken too my father (62m) in a very long time. As a result of this I have always known my father to be an unpleasant man. Due to my mothers abuse a large number of the family have taken her side and as a result I only see a handful of my extended family every couple of years.<br><br>My wife and I decided to have kids young so our children would not have to grow up in an unstable family environment. When we told my mother and family we were having our oldest she was very excited at this news. When we told my father he said to call him when we had him. Fast forward a few months and my wife gave birth a healthy 9 pound 13 ounce baby boy who we called Henry. For the first few years of his life I had limited contact with my father. This all changed when he was 5 and he was out riding his bike and was injured. I had sent my wife to visit him at the hospital and she returned in a bad mood and demanded that I take a backseat in my son's life because she believed I was an awful father. After this I started to take a backseat in my sons life and my father took him under his wing.<br><br>This year my father contracted sepsis as a result of pneumonia. My wife informed me he was in hospital but was going to visit him but I wanted to as well so she said I could tag along. When we got to his room he was barely conscious but still asked how my boy's (he shares the misconception that I'm not a good father at my wife) football team got on the other night. A few days later he was kicked out of the hospital due to his daughter (62f) refusing to pay for his stay. My wife and I both offered to help but my father said he would be just fine and that we shouldn't bother. When he didn't call us to say he was feeling unwell a friend sent someone over to check on him and he and my son were at his house with my wife's uncle. When they got back home my son said he was tired and wanted to go home. Later this same day my wife called asking if I wanted coffee or if I wanted to go get coffee with her. I said I would go get coffee and my wife said "I'll grab my coat". 15 minutes later she was back through the door. I said "why did you cut our date night short, I was looking forward to spending some time with you". She said there had been a mistake and she had just gone to my parents house only to find my son there with a cup of coffee. She confronted my son who admitted that he had gone back to his grandads house to help him make a cup of coffee but that when they had gone into the kitchen my dad was too weak to finish making the coffee so my son had finished it off for him. She told me that coffee was gross and that it had made her sick to think that I would intentionally drink something that had been contaminated with who knows what by my father. I said "what the actual f*ck mother?" and I grabbed the coffee cup and tipped it down the plughole. She said I had thrown away her good coffee drink and I said I was taking back what my son had unnecessarily thrown away by contaminating it and I threw it down the pan and dumped the remaining coffee in the bin. <br><br>I had to rush off to get ready for a meeting but on my way I could feel my wife textin me to kill me. When I got home she was seething and my son was in tears so I apologised to him and took him to get a new cup of coffee for me while my wife gave me shit about being an asshole. I tried to explain my side a few times but it just kept making things worse so I just need to know if I was wrong for throwing the contaminated coffee away.