I actually disagree with this as I was made to weigh people in at group and I always tried my best to be positive about any gain or losses despite not wanting the job and I never discussed anyone's weight. However at a different group when the consultant was away a snotty cow shouted my weight gain out so everyone behind me could hear despite it being fully accepted. As such, I just think it comes down to who is doing the job, and that is on the consultant.
For me the consultants were worse, the first time I joined slimming world the consultant gave me no choice about joining the social team, most weeks I'd be doing all 3 jobs and became very socially isolated at group (I was only 20 at the time and I'm very quiet, so weighing people in made me quite anxious) When I stopped losing weight despite following the plan she didn't care so long as I could still do the shop, payments and weigh in for her and she could continue swanning about drinking coffee.
As such, I've tried 3 different groups over the past couple years and never again - every group has bad eggs and clique like behaviour yet as long as the consultant is getting in the money they couldn't give two hoots.