They, and anyone else, is welcome to have as much avocado toast as they'd like. Just don't say that XYZ is unaffordable because their money went to other financial choices.
I'm an older DINK and I tell people I think having a kid is like buying a boat. It's a luxury good that has variable returns on happiness.
If someone was trying to get me to buy a boat I'd tell them I can't afford it. It's a shortcut to, Why would I spend money on something for "the economy"