This notion that everyone who doesn't send their DCs to private schools is jealous of those who do is complete and utter bollocks.
All 3 of my best friends sent one or more of their DCs to private schools for a variety of reasons. I'm not jealous of them, and I am perfectly able to remain friends with them and even have interesting conversations about school issues (which don't seem terribly different to me, personally).
Like @SoTedious I was privately educated, as was DH, we've made different decisions for our DCs. My Secondary Modern-educated DD2 looked round a few private schools for sixth form before deciding not to move. She now has a decent first degree and a truly spectacular Masters, by dint of working very hard and being totally focused on what she wanted to do.