No, I can safely say with 100% honesty that I have never looked in anyone's trolley (I mean in an actual shop, in real life) and thought to myself 'well, that'll be why you're fat/poor/insert unfavorable self-induced quality here that allows me to feel superior, then'. Much less on Instagram.
I really couldn't give a fuck what other people consume, whether they'll die 10 years earlier with a horrible disease because of it, or whether actually, they'll reach their 90's having smoked every day for 70 of them and eating whatever they'll like, and surviving poverty (self-induced, of course).
And I certainly never look at a trolley of 'obsessively clean eaters' and wish that was my life, either, or admire it very much at all.
You may very well reach 98 and spend the last 20 years of your life pissing and shitting yourself, miserable, with various health issues that do come from age or genetics, or you may not. I hate to say it that old age is rarely a dignified experience regardless, at some point along the line. Crack on.
When death gets us is very unpredictable and there are many, many things that can go wrong with the human body irrespective of diet that would make me think having some crisps, chocolate and fizzy drinks is worth the risk. Plenty of healthy people keel over, and young too. I'm not frightened of death.