I'm very conscious of this in my own experience as well.
Our household income puts us in about the top 5% of earners. Our social circle ranges from people with no income other than UC through to CEOs on dizzying salaries.
I feel like we are in a starkly different income demographic from the people on UC and the CEOs (though as that article points out, in absolute terms our household income is much closer to the UC claimants than that the 7-figure CEOs) - we are clearly much better off than than the UC claimants and much worse off than the CEOs and that's very visible in our lifestyles.
But I don't feel THAT different from the majority of people I know who (I would guess, based on their jobs) range from around median incomes through to incomes similar to our own.
Yes, compared with those closer to the median we may have a newer car, can easily afford a foreign holiday or two each year, shop at Waitrose not Tesco, have less outstanding on the mortgage, etc etc. And we have the (admittedly huge) luxury of not worrying about finances day-to-day. But our lifestyles aren't vastly different, we're not existing on another plain.
Perhaps I underestimate how much more wealthy we seem to our median-income friends - to me these things (Tesco vs Waitrose, etc) feel fairly insignificant, but perhaps it's more palpable to them? I think people naturally compare themselves with people who have more?
It's something I'm conscious of occasionally (like I'll let people suggest the venue for a meet up if I know they're likely to be in a lower income than me) but not to the extent that I feel like we're "high earners", despite the fact that I know that on paper we are.