I want to bring/eat fast food at social events
Why do you want to bring fast food to a social event?
I like to eat my own food or food they don't serve. I dislike the ones the host chose to serve
It's fine to bring your own food when going to an event. Doing this will save you money and time from not having to wait in a long line to eat.
I like doing it.
As long as it's okay with the people handling the event, then you should just bring your own food.