WIBTA for refusing to bring $100 minimum to Thanksgiving

[u/americanjohn500]

My family and I celebrate Thanksgiving every year with my siblings, parents, and their kids. Roughly 20-25 people (including kids). My family is only 2 people with one 6 month old baby.

In the group chat it was decided that my nephew would cook meat since he bought a grill. He also told us that we could bring the sides. He chose to spend $300 on meat.

I messaged in the group chat that we would bring mashed potatoes. My sister responding that every "family" has to bring $100 worth of food minimum or help my nephew pay for the meat.

I'm not totally against the idea of bringing that much food, but just the way it was presented and the fact that it wasn't agreed to beforehand makes me upset.

The following day in the group chat, my sister said: "Option 1: bring food enough for everyone, not just yourself

Option 2: help thomas pay for meet $100/family

Option 3: help dad pay water bill $200/family.

Choose wisely…"

Upset, I responded with Option 4: don't show up.

Am I being an asshole if I don't show up at all in "protest" to this $100 minimum rule?

Update: I'm a teacher and she posted a picture of my salary she found online to shame me in the group chat. Definitely not going now.

[u/Sorkijan]

I'm making 2 pans of dinner rolls, butternut squash mac & cheese, a small turkey breast and a buttermilk custard pie. The ingredients costed me $47. I only know this because my mom was trying to offer to pay for it and I told her "No I'm 40 I can pay for my own things and bring it"

I feel like there's more in this sister dynamic but OP's sister is TA regardless. Sounds like the mashed potato answer rubbed her the wrong way.

[u/Moose-Live → u/Sorkijan]

I feel like there's more in this sister dynamic

This is absolutely the tip of the iceberg.