<human>: So today, I went out on errands with my parents. 

Everything was going fine, I had gotten a new book, we were planning to go to a movie, and had decided to go to Costco to kill time. At Costco, my mom (43/F) and dad(44/M) got hot dogs and I(16/F) got a slice of cheese pizza. We enter Costco:

1. A little into Costco, my mom bumps into me because I had to stop suddenly and dropped her hot dog on the ground, forcing her to throw it away. My dad instantly blames it on me.

2. After offering the 95% left of my pizza to my mother and having her decline my offer, I continued to walk around Costco with them, taking small nibbles of my pizza since I was still full from the breakfast I cooked for myself. My dad pulls out a thing of flashlights in preparation for Idyllwild and walks by me. He notes that I still have a lot of pizza left and asks, "Are you gonna finish that so you can take some of the heavy load?" I didn't respond since I was chewing my last nibble of pizza. He continues walking and says, over his shoulder, "Actually, I hope you DON'T finish that."

My father just called me fat in the middle of Costco. 

I looked down at my pizza for a minute, then pivoted on my heel and threw the last of it in the trashcan along with my Coke. Holding back my tears, I walked to the bathroom, where I locked myself in a stall and bawled my eyes out. 

His excuse? "What? It's the truth, and I don't care."

I don't know what to do or even what to think? The only thing I've determined is to stop eating.

Can you summarize the given text in a few sentences?
<bot>: My father decided it would be perfectly okay to call his teenage daughter fat in the middle of Costco. Not sure what to do or think.