This is the thing about bub hub. So often a thread is made and people get jumped on because "you don't know their life story. don't judge. there might be a reason". Surely, without knowing the statistics, there is a 99% chance the kid didn't need the coke for diabetes, he just happened to like it .
I was on holidays in Byron Bay and a little boy of about 2 ran up to his Mum grabbed her drink and took a mouthful. He instantly spat it out and said “yuck. It’s diet coke. I want the real stuff”, then he took a mouthful of his Dad’s coke and ran off again. The parents were cracking up that he knew the difference between the two. Did I judge. Yep, I did actually and I know nothing else about their lives other than their 2 y/o son can tell the difference between Coke and Diet Coke.