AITA for being upset after my dad said he’s dating a streamer I dislike?

now I’m not really on twitch often so I honestly forget people that I watch on there but with the people I do know I really don’t like I honestly just follow because I like their videos so basically what happened was my father had messaged me as I was minding my business in my room doing some work, and as I looked down I saw the texts. I will admit I did somehow managed to read it wrong, but I was just so excited to the point where I really didn’t see the miss happened in my thinking I truly thought that he got a girlfriend after a while because him (38M) and my mother (35F) had broken up before they even gotten married around 2013 and so I was excited to hear that he was getting a girlfriend. It turns out that he was just playing a dumb joke like he usually played on my mom when they were still together when I was a child and before. this honestly hurt me when I found out that he was joking, and I truly wish that it was not a joke because if he was actually dating somebody that I liked or just dating somebody in general, I would’ve been extremely happy, especially if they were a streamer because that would’ve mean that he wouldn’t have to work his ass off 24 seven so just cover the basic expenses. He worked as an IT department person for a little while but now he works in car sales at his side of the family’s auto shop owned by my cousin?(I can’t remember if he’s an uncle but we all call him cousin.) It pains me enough to say this, but I honestly don’t wanna talk to him for the rest of the week after this. I know this is a small story, but am I the asshole for being upset at my dad? Also sorry for any bad grammar I was using the voice to text because this is a long thing for me to type.