I came from a very poor background and met and married a man who was from a slightly higher social bracket than myself but he was not in any way privileged.
We worked our socks off for decades, often noting that others were taking it easier, having nice holidays, cars, experiences and things and spending on ephemerals while we were living frugally, debt free, paying down the mortgage and saving.
Over time we came to be envied and resented as if we had been given all we worked for. The words, ‘you are lucky’ were quite often repeated to us, and not in a nice way. An added irony was that our children had friends who were actually very well off (banker and oil industry parents etc.) and we saw what real wealth could buy. We knew not to make the mistake of thinking them lucky, however, or, for example, their seven holidays a year would have spoilt our week in a cheap French gite or their Mercedes our second hand Ford.
Looking wider, I think that the politics of envy are spoiling public life and causing individuals who are jealous of others great pain. I hear people who are free, happy and able to enjoy a great life due to the things we have for free in this country, complaining about their lot and that of others. In focusing on the lives of others they forget to be happy and grateful for what they have themselves.
You friend, OP, is lucky to live in the UK, but then so are we all.