I'm certainly not resentful - though my own parents were simply to poor to help out in even the most minimal way after I left for university at 18, and with numerous younger siblings in a very small house, returning after university was never an option - more baffled by alterations in expectation from university leavers.
I don't remember any such obsession with 'getting on the property ladder' as being a major goal, and ideas about being entitled to a certain minimum standard of living, or the idea that large numbers of people felt they had no choice other than to return to their parents' house after university. We would have seen it as a defeat or a sign you weren't able for the real world, which just involved being poor and surviving You worked at whatever job you could find and rented a room in a house share close to that job, wherever it was. Or you squatted. Or, for my generation of Irish university leavers, you emigrated because there weren't any jobs.
I lived in house shares for the best part of ten years, and at one point, although I was already working part-time in my first academic job, I was living in a disused London warehouse under one of those Camelot 'this building is occupied' cheap rent schemes. With about eight other people, many also working in professional jobs. I was well into my thirties before we were able to scrape together the deposit on a tiny flat. The same is true for a lot of my friends, who are academics, writers, musicians, lawyers - many still rent.
So the idea that it's all different now because' in the past everyone was able to buy a property by the age of 22' doesn't chime at all with my experience.
What has changed is the expectation that you should be 'getting on the property ladder' and that going back to your parents is normal and expected as a step towards doing this.
I don't want to sound all 'Ooh, in my day we walked barefoot to school through the fields, warming our hands on a shared hot potato and eating worms for lunch', but as someone who has worked for a decade and a half in universities, I have seen the psychological age of the average undergraduate get younger and younger and their parents get more and more involved in their lives in a way that is - for me - infantilising.
I mean 'helicopter parents' coming in to query their children's marks (sometimes with their children, sometimes alone), or phoning to offer excuses why their offspring didn't make it to a lecture. It can't be unrelated.