To begin, this hasn’t occurred yet but I’m considering not going to my sisters birthday dinner. My mom, dad sister (27), I (25F)all live together at the moment. They all have a dinner planned for tomorrow night at our house for my sisters birthday, which they want me to go to. I’m thinking of not showing up due to previous circumstances. My birthday was on July 4th and the week before then I was in Florida, I specifically got a flight home early in the morning on my birthday so I could spend it with my family. They said we would have a dinner and do things together, my sister specifically said she would go on a hike with me. The day I get home I ask my sister to go for a hike.. she says no she’s too tired. I was upset but went with a friend instead. Hours later she told me she happened to go on a hike with her boyfriend an hour later which annoyed me immensely. Then, I asked my parents to do something with me but they said no and left the house for a bbq so I was literally by myself for the rest of the day/ night without my family even though I came back from Florida just to be with them. My sister told me we could go out once she got paid for work (I never asked her to pay for me though) and it never happened. a day after my birthday she sends me a Snapchat with wrapped presents so I get all excited and ask her about them when I got home.. she told me they were for her boyfriends birthday coming up.

After all this I’m really not inclined to go to her dinner when they made me feel like crap on my day. I don’t see this as being petty, I just don’t want to be around people that treat me in such a way or celebrate someone who was completely inconsiderate to me. Would I be the asshole for not showing up?

Edit: I should add that this dinner will be at our house not at a restaurant. I could always find something to do while they’re having it like go for a hike then get takeout or something.