I honestly think fat shaming is not only ok but should be encouraged
Really? Do you really think people should  shame others?
Yes, and everyone should do it.
You shouldn't go out of your way to shame people. Hurting their feelings will turn them to food even more.
It's a sick world if you can't make jokes about fat people being like whales and i'm not saying fat people are horrible people.
I hope you're actually joking about this. Making offensive jokes about a person's medical condition, such as obesity, is completely wrong. I hope you can come up with more appropriate jokes to tell.