But what's surprising about that "mentality"? Breeding is something some people indeed come to regret, and having the self-awareness to recognize that likelihood in one's self leads to better outcomes for the not-parent and the not-child[1].
A big part of what what I've seen in having these discussions is people resenting those who made different choices. A lot of people follow a script - get married around this age, acquire home, make a kid or two once you can afford the tax privileged accounts, etc. Some of those people resent those who saw they can write their own script and fail to look unhappy about it.
[1] I always hear, "but what if you're wrong?" To which I reply with some variant of, "You should go to medical school. Sure, you're a bit old for that, it is expensive, a huge, somewhat risky commitment, an enormous change in your life for a long time, and you think you'd hate being a doctor. But what if you're wrong?"