The whole “you should be grateful for what you have” narrative is bullshit. The only way human civilisation advanced was because people didn’t accept “good enough” and strived for improvement. This is especially true when people talk about first world problems — the core reason the first world is the first world is because prior generations said “not good enough” to their governments and corporations.
The boomers, however, reversed or squandered many of the massive gains they were left with —mainly attributed to the labor movements of the first half of the 20th Century — and set their children and grandchildren up to be worser off in most critical metrics. None of their successes will matter when the planets ecosystems collapse.