I have zero clue as to what you’re so offended about.
People like you, actually.
So childfree people should mark in their calendars the crotch goblins’ birthdays and buy presents for them? Become “uncles”? That kind of commitment to children is what we’re avoiding, for crying out loud.
And, despite your ill will, my friends are many, and most of them are childfree or have grown children, and our shared activities are, excluding very rare occasions, devoid of infants.