Yea... it was unfortunate that so many people focused on that instead of the general problem and now we are barreling toward a very bad outcome. Ultimately, it doesn't matter what wealthy people do - they're going to be just fine regardless of what the rest of us do, except that if we kick and scream about their big houses and refuse to do anything we just wind up inheriting the problem and they're still right where they started. I somewhat feel this way about abortion - like I can afford to move my family or fly a family member somewhere to get one. Can you? Might want to think about that.
The other issue is that focusing on something like this megamansion (as grotesque as it is anyway - seriously a lot of these rich people are just tasteless losers) leads down to a never ending condition where you just never do enough to satisfy people who have no interest in changing their habits anyway.
If Gore sold his megamansion they'd say "hey you are still flying", if he stopped flying they'd say "hey you're still driving a car", if he stopped driving a car they say "hey you're not growing your own vegetables", if he started growing his own vegetables they'd say "hey the tools you use come from a carbon emitting supply chain" and if he stopped using tools and made his own they'd just keep on and on and on forever until we get global warming anyway and so many people are screwed. There's no genuine interest in solving the problem, they just want to distract you.