beated

So Sydney was trying to have a contest with Mollie over who could finish their water the fastest. Sydney did. She said, "Mollie I beated you". Mollie said very seriously, "Sydney, it's beat. Not beated. Beated isn't a word."
HAHAHA!
Mollie is actually the one who randomly started adding -ed to the past tense of a lot of words in the last few months. I guess she finally figured it out.
It was so hilarious. Sydney just looked at her like "what the heck, who are you?"