Perhaps if they make up reasons why being over is healthy, then yes.
I disagree with the parents assertions that PB is unhealthy, but also disagree that people can't be criticized for their weight, if they have control over it.
I think shame is a poor tool for anything, but I think people who are overweight should be made aware of the health implications and continuously encouraged to lose weight, in much the same way that smokers are continuously reminded their habit is killing them.
I always find it bizarre that overweight people get all the "positive body image" stuff in the press, despite it being well known that its unhealthy, while underweight people are never described that way. Neither are healthy.
I disagree with the parents assertions that PB is unhealthy, but also disagree that people can't be criticized for their weight, if they have control over it.