Is "mom" or "parent" a dirty word in today's society?

Inspired by this question and thread.

I don’t know if this is a new trend, or if my parents had to deal with this BS, too. Many people I encounter, especially on the internet where people are shielded by anonymity, see parents as burdens to the rest of the non-breeding society. This is especially true when the word “mom” is mentioned.

Ex: That “mom” and her crying baby on the bus…
Some “mom” in the minivan…
On one thread, a flutherer told me that graduation ceremonies are not places for the convenience of people who don’t know not to bring their children.

What’s with the disdain? Not just in the question I linked which I feel is misguided, misinformed and prejudiced, but in society in general?

In a world where I feel like we’re becoming more open to religion, sexuality, race, and lifestyle, why is acceptance of this subset closing? Does choosing to have a child automatically mean something negative about a person? Did it mean that about your parents, too?