I have personal experience of exactly what you're talking about - family members who would provide fodder for one of those sneering C5 documentaries. But do I wish their kids couldn't afford to eat as a result of their parents life choices? No. And do I think that just because some families like this exist, all low income families should be left to rot? Also no. I equally have other family members working multiple jobs and getting nowhere.
I have a weird situation with a foot in both camps, and you're right when you say it is another world. Over here in the "land of the wealthy", 4 or 5 rental houses were purchased during the 90s and providing the rental income that lets the kids do the unpaid internships that will then propel them into the best jobs, £600k flats are being inherited, pensioners book their third 5* holiday of the year and school fees are paid by grandad.
These are the people we need to be looking at. Not squabbling about whether a 6 year old might go home to a warmer house thanks to a lifting of the 2 child benefit cap and then ALSO shock horror get a free lunch at school and a bowl of porridge at a breakfast club.
I have sympathy with boomers who worked hard to get where they are, saved up, and now feel targeted for their success. But the piece of the puzzle I think they're missing is that working hard and being sensible doesn't get you there anymore. There are families doing their absolute best and they are sinking - and when you weigh that against a handful of people taking the piss - who do you side with? You surely have to accept that no system can be perfect and some will get some things they're not entitled to?
It's all such small fry when you hold it up against the huge sums of money in the "other world" you talk about - hold those people you sneer at in the other world to account and make them pay more damn tax!