Being in a divorce currently, I have noticed a few things that aren't talked about that I think lead to these memes being so popular.
Divorce laws vary a lot from location to location, in the US they are all state level laws. Not all state level divorce laws are fair to both parties, it seems to get worse if children are involved (some states have recently been adding laws that state 50/50 custody must be the assumed starting point because it hasn't been).
Even if the divorce laws are written to be fair to both parties in theory, at least in my state, the judge has the flexibility to rule in ways that may seem or even be unfair (what is equatable is complicated).
Even if the judge would or does rule fairly on all issues presented to them, the lawyers (if the parties can even afford lawyers) may be perpetuating gender biases in divorces as well. So the issues may never even reach the judge and just be settled by an "agreement" between the parties pushed by the lawyers.
Most divorces settle, maybe even on terms that heavily favor one party, because going to trial is a lot of money. Lawyers know this and have "games" they can play. like 60%-70% of assets to one party is still cheaper in theory than going to trial for the other party, so they hold that line in negotiations and your own lawyer will push for you to agree to terms like that as a cost/benefit analysis exercise.
Even if none of that happened and it was fair the whole way through, it is a very complex emotional time, and men often don't have the same level of social support to vent to.
Telling people to stop unless they are in some level of extreme situation is really toxic. People need to vent and be able to talk about what they are going through.