My DS started to eat solids at 6mo and by the end of that month he would almost eat as much as his sister, DD then 24mo. He had a couple of tiny teeth and would eat things like banana, soft apple, soft carrots, baby "crisps" things like carrot puffs, toast, (overcooked) spaghetti/pasta, rice, etc. He was massive and had (has) an amazing appetite. Even to this date (2.5yo), he has second servings of most mains. His sister still eats selectively, some days she would eat anything, some days she ignores most of her food.
I do believe OP. I was once doing that baby weighting at the GP's baby clinic and we usually got seen in pairs, with two HV in the same room. The mum next two me had a 4mo and was explaining to the HV how her DS didn't like porridge but loved chocolate pudding and strawberry yogurt. The HV sat her down and started to bring her all weaning leaflets she had around. That was a 4mo. If she had continued for two months, she would probably be where OP's friend is now. I might assume OP's friend might think it shows how big he is, how he's eating on his own, how cute with all that ice cream smeared on himself... If she does it for the pic, not too good but hardly long-term consequences. If she actually does this on a daily basis, thinking it's ok, it can damaged her child.
For the record, some people do think children should have sweets. My mum insisted a grandparents' duty was to spoilt the grandchild and in her mind that meant giving them chocolate and sweets from the start/when weaning, such a bit of chocolate yogurt or Nutella on bread sticks. When I insisted I didn't want any sugary stuff for as long as I could avoid it, she complained and moaned as if I were banking a fundamental right, insisting I was being mean and cruel! So yeah, some people think children should have sweets as a regular treat... 
I would judge too, I would struggle not to say anything. I would be forwarding articles on nutrition and babies, as in "wow, I've just received this, have you seen it? Food for thought! (Pardon the pun)"