I won't enter into a relationship with someone if they are too fat
Do you only want to be with someone who isn't fat?
Yes, it's unattractive when people are fat.
It can be quite rude to your possible dates to call them unattractive only because of their weight. Judging a book by its cover is something that you shouldn't do, they could be an amazing person and you don't realize it yet.
I already know me and fat people are not compatible.
If someone has all of the attributes you like, except they are fat, you won't date them? There is no reason to think like this, as people can lose weight if they choose.