It's one thing to say "It's just a joke bro", but it totally ignores the fact that jokes have behind them rhetoric used to sway people. It's what jokes do, and if we don't admit that "Hey, maybe this joke isn't true to reality and does more harm than good". After all, most of the boomers that are being blamed for the climate crisis didn't really do anything to deserve it. They only own stuff, you don't but ought to yourself. Like a home. That's pretty much the difference, we were born into times of austerity while they prospered during the New Deal (which has it's own historical context for why it even existed, in part largely due to the red scare).

And to say that we should hate them rather then the people that introduced that austerity, even as a joke does not help anyone. Not the boomers, not you and not me.

They voted Reagan into office and kept falling for those policies while coveting suburban housing contributing to sprawl and collectively shrugged as the world kept heading for where we are now

Reagan isn't just a singular boogeyman that has ruined the world, he was just a part of a developing trend of neoliberalism that would've come sooner or later. If not Reagan, someone else would've done similar shit to him, especially after the dissolution of the USSR when that shit hit the gas.

It’s only the last couple generations that are sounding the alarm because the fire has reached our doorsteps in our rented apartments we’ll die in.

Well, class consciousness is developed through material reality so there's that. Too bad that in the Americas "Fuck you, got mine" mentality is so strong, and not just with the boomers. I've seen plenty of people behave that way, and it's a primer for the development of fascism complacency in the population.

By closing the door behind them.

They didn't do that. It was the capitalists seeking to gain more profit, if they didn't exist the door wouldn't have gotten closed as there would be no reason to do so.