These people are judging themselves. Living your standards simply reminds them of what they feel are their own failures.
A longtime friend of mine--very smart, and from an ostensibly "good" family background--surprised everyone by getting pregnant oow. We visited her in the hospital and her mom told us that she just swore up and down that we were going to hate her. Honestly, none of us had anything negative to say about her. We didn't talk bad about her, nothing. Gave her a card, coo'd at the baby, and left. But she was just convinced we were going to judge her.
Then, a couple of years later, she popped up with oow baby #2, by some other guy. Now she's started making snide remarks toward me as if I've done something offensive to her.
Unlike some other friends, I don't crack jokes about her, I don't insult her. I really have nothing to say other than that I hope she finds happiness in her life. But she's just got it in her mind that I have some kind of negative animus toward her.
I don't. She knows she messed up, she is disappointed with her choices, and is projecting those feelings onto me as if I'm the one saying there's something wrong with her.
At some point you just have to know that very often people are projecting things onto you to avoid examining themselves.