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The original was posted on /r/AmItheAsshole by /u/Leranxes on 2023-09-12 07:12:51.
I(20m) had a rocky relationship with ‘Andrew’(21m) from the beginning. My mom married his dad six years ago, and they made me move out of my bedroom so he could have it to himself because he said he doesn’t want to share. They made me sleep on the couch instead of getting another bed.
He spent the next several years making fun of my hobbies and calling me feminine for my obsession with origami.
Two years ago, he slept with my then-girlfriend ‘Kate’. The day I found out was the final day I actually considered him my brother. After that, he was just my mom’s stepson.
Yesterday was his birthday. I haven’t seen him for over a year and I didn’t attend the party. When my mom asked me why I didn’t drop by with a present, I told her “I just don’t care about his birthday.”
She said “Last month you went to your girlfriend’s dog’s birthday party. You bought him two toys.”
I said “Well yes, but I actually love my girlfriend’s dog. I don’t love Andrew.”
She asked if the dog actually means more to me that Andrew and I said “Absolutely. Your stepson means nothing to me.”
She then screamed about how I’m a disgrace and called me a disappointment, saying I shouldn’t be ‘so cruel’ to her.