Obesity is obviously deadly and fat "acceptance" is just as disastrous as meth acceptance. In fact, obesity kills far more than meth.

But my greater point is that we are obviously all okay with negative social stimulus (shaming et. al.) to curb bad behaviors. This is how virtually all social conditioning works and it's part of how we have a civil society. I don't think it's a good idea to decide some negative behaviors should be immune to negative social stimulus. Apply the same rule to everything, one way or the other.