Empathy and understanding, without offering advice or judgement, is apparently difficult for many of the humans in our lives. Everyone has it hard, parents especially, and a childfree telling a parent (or vice versa) how to live is egregious and ridiculous.
You're a better person than I for walking away tbh, I would have lost it.
Thinking of you and your family, you're absolutely smashing it man, you are fine and good and doing amazing!