Is this a justifiable reason to judge somebody?

I don't have a problem with fat people if they try hard to lose weight but I hate fat people who don't do anything about the fact that they are overweight and don't take care of their appearance at all by dieting or eating healthy and choose to get even fatter. I think being fat is okay if you are trying to lose weight. It's not okay if you are okay with being fat and happy to get even fatter.
Is this a justifiable reason to judge somebody?
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