AITA for not wanting to call my brother on his birthday

Today is my brother’s birthday. I have 4 siblings. I’ve had a turbulent relationship with my mom in the past couple of years. I am almost 30, married have a child and another one on the way.
My brother is an awful person. He is still a teenager. He was adopted at age 3. I am the eldest daughter and am much older than all of my siblings, my mom had me at 20 and my half sisters have a different father than I do and 2 of my siblings were adopted.
My sisters are amazing. Close in age to my brother.
My parents make excuses for my brother. Blamed it on mental health, his adoption, trauma, school bullies, his ethnic background, but they completely enable his behavior, baby him and spoil him especially in comparison to my sisters. This frustrates me. There’s a lot of favoritism on my mom’s end towards my brother that is undeserved.
We (my husband & baby & I) visited last Christmas and my brother did not like his gifts from my parents. On Christmas he had such an ungrateful attitude towards them and wouldn’t move past it to a point that he ended up in a mental hospital. The police were also called on him by my parents the day after Christmas. For the greater half of 2025 he has been in hospital, therapy, or had the police called on him.
My brother is shallow, entitled and erratic in his behavior and has been for years. My parents relied on him growing out of this behavior with time and age. He didn’t. He has been in therapy, hospitals or had school and social problems FOREVER.
My parents buy him new electronics/sneakers at a frequency that is not done for my sisters. My mom even brags about not buying hygiene products for my sisters once the reach a certain age. And they work. He doesn’t.
My bday was in August and every sibling texted me happy birthday except my brother. I love my brother but I do not feel he loves me.
I had no intention of not reaching out for my brothers birthday, my mom sent a text promptly at 9:40am “don’t forget to call your brother” to which I replied “right, no comment”.
it’s funny that she assumed I’d forget his birthday (I didn’t) but he actually did forget, or not care about my birthday. She replied “that’s plain mean”. It seems she just wanted to phish for an issue with me which is not uncommon for her. I’m pregnant and I don’t really want to be name called by my mom?
I completely disagree with how my parents are parenting and babying him. I do not believe they are raising a good man or human.
They sent him on a 10k trip that they fundraised (which I also am upset by because my parents are not struggling and I don’t think my brother is in a position to be handed a 10k trip) to his country of origin this year AFTER putting our entire family through mental torment to “find himself” and he fucked off in the hotel the entire time and ate McDonalds. I’m so disgusted by how my parents enable him. I did end up texting him Happy Birthday but am I frustrated at my mom for worshipping my brother. AITA for feeling this way?