There are many lean people that eat absolute crap, and are as unhealthy or more. I don’t think we make fun of bad eating habits; we make fun of fat people because they don’t fit into certain beauty standards.

Also, being “fat” doesn’t mean you’re not healthy. Being a bit chubby or overweight is perfectly normal, obesity is a problem.

And I think calling people “lazy” for being fat says more about you than anything. Exercise isn’t the most important factor on weight, eating habits are. Specifically, calorie intake.