I also rent, and find the 'I made all the sacrifices' talk really annoying.
Like we didn't!
However, no-one could have known that in a recession, interest rates wouldn't soar to 12% but would actually drop so much people would be paying off huge chunks of their mortgage. It's just luck. Several of my friends were completely over-extended mortgage wise around that time, and had interest rates had gone up, they would have been stuffed and lost their houses. There's still a lot of people in negative equity.
It's not necessarily a matter of 'working hard', I bought and sold property which in hindsight, had I known historically low interest rates were round the corner, should have toughed it out for a year or two.I thought I was doing my family a favour by getting out before it all crashed, when our payments were so incredibly high (and we lost jobs)- I was wrong!
If circumstances changed, people's 'luck' will change again.
Honestly, I know it sounds trite, but do just think how lucky you are to have a home, even if rented. I do. I don't really get all these threads on MN about people being jealous/seeing their neighbours with bigger cars/better things. There was one the other week where someone with a 2 million pound home tried to tell us it was hard living on a street with 3/4 million pound homes. If you haven't cracked happiness by the time you are in a 2 million pound home, you never will.
Your soul isn't going to be happy fed by jealousy. Lucky them, they have a house and rent it out, but you will be lucky in different ways.
That's not to say the rental system and housing system in the UK isn't utterly rotten. It is. But I don't think dwelling on your landlord will solve that.