Feed their kids processed crap, junk food and sugary drinks regularly.
I can't help it. I always notice what is in people's baskets in the grocery store or on the belt in the check out line, and I cringe inwardly. It makes me want to slap someone when I see can after can of spaghetti-O's and raviolis, cases of ramen, boxes of hamburger helper, hoards of junk food like chips, hostess', etc.. Of course, I never say anything or give dirty looks because it isn't my business, but it seriously upsets me, especially when they have kids with them. Even more so if the kids are overweight.
And, I know it's not my business. You can save the 'they might be "poor" or have whatever else excuse in the book', whatever. I don't care. Those poor kids have no say in what they eat and are being fed nothing but preservatives, chemicals and pure crap.
What do you secretly judge people about? And don't say you don't because every single one of us is human and has our own opinions, whether we voice them or not.