AITAH for quitting my job without motice.

A little background here. I have been working at my job for 18 years and I worked my way up to supervisors or the facility. Then 3 years ago I went on a week long family vacation. Soon after I got back they demoted me without notice. That's where the trouble began. Fast forward to June of this year. I have two sons and I have never ever missed one of their birthdays. June 1st was my oldest son's 18th birthday and I had already been approved to come in early, get some work done, and then go home to my family. As I am leave my new supervisor, the guy who took my position after I was demoted, told me I couldn't leave and had to stay there and work. So, I got in my truck and called my wife to tell her what happened and to tell her I was going to quit. She encouraged me so I did just that, quit without notice and never looked back. So, AITAH.

Edit: I was hired at another job within a week but I took the summer off to be with my family. We had enough money to last the 2 months till I started my new job.