I have seen this kind of lie before. Seems about the same honesty and intellect level as the people claiming a right to 'reparations' for Slavery even though they personally never suffered from Slavery, and in most cases their family never suffered from Slavery.
There are three lies there: That everyone in a group can be blamed for not providing something wanted, even if they themselves were not able to do so, that there is a basic responsibility for one generation to make sure they work hard for someone else, and that the 'Boomer' generation was the 'first to neglect that responsibility'.
To the first lie, blaming everyone who happened to live at a certain time is blatantly bigoted, and ignores the actual condition of real people. It needs no further comment beyond the fact that blaming an entire group is ignorant, malicious and something worthy of rebuke rather than respect.
To the second, we can discuss the responsibility of parents to provide a basic level of means for their children, but nowhere is it the case that parents owe good things to their children their whole lives; once the child is an adult that child becomes responsible for their own welfare. And further, even while young the child has a duty to make something of themselves, by going to school, learning civility and personal responsibility, so that when they are an adult they can not only build on what they were given, but continue their personal improvement to become the person they hope and mean to become.
To the last lie, these greedy malignants start with the people who fought in World War 2, ignoring all history before that as well as the failings of that generation. Without going too far into the weeds, the United States has had a number of generations which saw economic hardship, and like now they were not the fault of a generation, but were due to specific causes, some the result of wrongdoing but others unforeseen. The United States was rural and agrarian when it was founded, which meant a hard life for many who lived and died in poverty. The reason some were Tories was because breaking with England meant a loss of finished goods and comforts; the cost of our Revolution is often forgotten by those who only want to tell a grand tale of how we became independent. The generation of the 1820s was therefore "guilty" of not making things better for most of their children.
The roads, canals and railroads built during the early 19th Century provided opportunities for farmers and merchants, but the cost in tax was a further burden on many others. This led to an industrial expansion which drove many to poverty, forcing former farmers to sell off their land for almost nothing and move to cities. The generation following the Civil War was therefore "guilty" of not making things better for most of their children.
And of course the generation which speculated in stocks during the 1920s and brought down the banking system as well, they too handed their children poverty in place of a better life.
Now as for the Boomers, who these haters would blame for not making sure the current generation got everything they want, they faced the highest levels of Inflation and Unemployment since the Great Depression, were responsible for fighting in two major wars that Congress ignored when they became inconvenient, created the first serious efforts for nationwide Civil Rights since the Civil War, made the first efforts to address air and water pollution, created the computer for personal use, and were the first generation in a century to force the government to address corruption to any serious degree with Watergate and the Abscam investigations. This generation was the first to challenge abuses by the CIA and FBI.
The Boomers did leave things better than they found them in many ways. They received no thanks from the malignants, however, just demands that they should have made the current brats rich as well.