This person really loves stereotypes, don't they?
First, the stereotype that all mothers are selfless creatures worthy of praise, no matter their motivations for having kids, their circumstances, how well they take care of the kid-they're women to be revered as the selfless beings they are.
Second, the stereotype that the opposite of having children is excessive shopping (someone please define excessive) and jetting off on holidays. I really didn't get the memo that our options were just limited to those two things.
But of course, jetting off on holiday for two weeks out of the year, is absolutely more damaging to the planet than churning out multiple children and all the resources that will be used to nurture those children and their children should they go on to reproduce.
But it's the CF people who are selfish and destroying the planet.
As for the point of that thread-it absolutely is selfish to have a child at 50. I don't give a flip if that's an unpopular opinion, but it is the truth. Some of these people who does this want to put the blinkers on and pretend that it's not selfish when it is. Having a child at 50 is setting that child up to be a carer or have to deal with ageing parents long before they're due to.
It's impossible for me to see that setup as anything but selfish.