It would all depend on their personal hygiene habits.
It isn't nice to pick on fat people, even though that has always seemed the trendy thing to do.
Not everybody who is fat can help it.
It's not always a lack of self control or will-power or due to being lazy that makes people fat.
Some people have very real medical conditions (including taking some medications) that create their obesity issues!
And let's not forget eating disorders ... It's always been trendy and acceptable to be anorectic or bulimic, but god help you if you have a binge eating or compulsive overeating disorder!
Empathy and Compassion are still lacking in this area, especially for people who have never struggled with being picked on, teased, tormented and bullied due to being overweight!
Therefore, perhaps, if we can't say anything nice, then perhaps we shouldn't say anything at all?
Mean People Always Have And Always Will Suck!