Oh, give over. There is something about posting online that makes people feel like they need to have the fake impartiality of the BBC. We don't! This man is nothing to us, we've never met him or spoken to him. But the OP sounds lovely and funny and has posted because she's having a tough time holding down the fort alone and looking for some solidarity. If your friend, auntie, or slightly drunk acquaintance at a party told you this story - about the house, the decor, the divorce - what would you say, "oh but think about it, it's a cheap shot to take the piss"? Of course you wouldn't. You would LAUGH, tell her she's well rid, and offer to root around the garage for a nylon fake sheepskin rug and comedy holiday shot glasses.
This idea that we can't laugh at things that are uncool because it's a man living his freedom to me misses an important aspect of human conenction. No one is suggesting that the OP's ex goes to prison for his crimes against the Natural Passage Of Time. But the reality is that when divorces happen it's almost always the woman who stays to parent solo, handling the emotional and financial brunt of family life, while the man galavants off to live carefree. Of course, most of us would never choose to swap, because we prefer being the parent that stays with the kids. But it is stressful and upsetting, especially if after pouring decades into raising children the reason given is "I want to date people who are MORE FUN THAN YOU!". The Mojo Dojo Casa House is funny precisely because it represents a pattern we all recognise.
What are we supposed to do, as women, in the face of this pattern? In the face of this bullshit social expectation that women carry on, wihtout complaint or even comment, and men go and live their best lives in 90s decor? We could sit around and cry about it. We could (and should, and do!) get man about it. But also we can sit back in our lovely normal adult home with our children and just take the piss out of it.