AITAH for giving my siblings baked goods for Christmas?

Hi this is the first time I’ve done this and I’m only doing this cause this has been bothering me, i am a 34 year old male, I have 3 siblings one older sister +1 years older than me, 2 younger brothers -3 and -4 years younger than me, my sist has 2 kids one daughter 10 yrs and a son 5 yrs my middle brother has a son that’s 3, this Christmas when we went gift shopping we tried to be personal for the kids, and get them each something we thought they’d love, my niece got a loungefly? The Disney back packs, I think that’s what it’s called, back pack Pokémon themed with here favorite pokemon, eevee and all its eevelutions, my older nephew we got him a monster cop truck cause he absolutely loves both monster truck and cops, he always makes me go say hi to cops whenever we see one and I’m watching him, and my youngest nephew and construction toy set that lights up and makes noises, my dad got a cheese board from mooville, and my mother also got a loungefly bag, now my siblings, they got baked goods, my GF who I’ll add, got up at 2:30 am to go to work, and didn’t get home till 6-7pm ish decided she’d bake cookies for my siblings, she baked multiple types of cookies both Christmas Eve night and Christmas morning for them, from peanut butter chocolate chip to no bakes to sugar cookies, and each sibling got an equal assortment of these cookies, we get to Christmas and we’re having a good time watching the kids open presents, I even talked to my sister about taking my niece to universal with us cause her and I are big Harry Potter fans and from the same house, HUFFLEPUFF!!!!, and reminded my youngest brother I was still gunna take him to the movies, we’d already planned on going because a movie we both wanted to see had just come out, at the end of the day my GF and I went home happy and full, but the next day I got the message that really set me off, from my mother and I quote,”So. (Sister) kinda feels she go the short end of the stick… getting cookies. You gave (niece) and I kick ass bags, taking (youngest brother) to movies, got dad a cool food basket, the boys both got trucks they liked (not as cool as the bags but still cool) lol….. and she got cookies….

She had no money and everyone go the same thing

And I reminded her that ALL my siblings got the same gift and she commenced to argue with me about it, she kept trying to get me to see it “from her perspective” in the end my GF and I decided, and told my mother, that from now on every sibling niece and nephew would only be getting a card from us

Am I the asshole here?