It’s hard to create positive improvement out of negativity
I have family members that are obese, even a couple nearly or actually morbidly obese, so while I think it’s out of gross laziness/lack of self-esteem/respect that most people this fat got to be (and stay) that way, I also recognize that positive encouragement is the best way to affect change. Negativity usually just breeds more negativity.
I accept fat people for who they are, which means that they may be nice people, very genuine, caring people, they are also lazy or have large self esteem/respect issues. This doesn’t make them horrible people, it just makes them flawed in a way that is very visible and off putting to many. The joy I felt when a family member (who is likely morbidly obese) confided in me that she’d been slowly losing weight and not telling anyone (truly driven by just herself) was immense. Since that point I’ve been communicating with her to encourage her and help her get to a healthier place.
What the fat acceptance movement doesn’t understand, is that nobody should be accepted for not being healthy and for having some shortcoming that they can control. We should all be encouraged to be the best that we can be. I accept it if someone wants to be fat, but that doesn’t mean that I have to consider it a smart choice or a healthy choice or something to be praised, just like I accept if someone wants to smoke or they want to drink to excess. That’s their choice, it doesn’t make it a smart or a respectable one.