This isn't wrong,
per se, but it's incomplete. Keep in mind that:
- Class is a significant driver of culture, so families from different socio-economic backgrounds will be prone to different vices; and
- From a Christian perspective, the point of virtue is to develop one's strengths for the purpose of supporting others.
The Prosperity Gospel bullshit is heretical in lots of ways, but mostly because it misses
both of those points. For (1), it encourages people to automatically associate wealth with virtue and poverty with vice, when reality is almost never that simple. And for (2), it tells the well-off that their wealth is a sign of election. If God is clearly pleased with you (due to your financial success), there's no need to put your significant resources at the service of the less fortunate. They just need to bootstrap themselves into election/ financial independence, etc.
This is completely foreign to the Tradition. A very cursory reading of
St. Basil the Great or St. Gregory of Nyssa should quickly disabuse any literate Christian of the notion. The rich in any liberal society, almost by definition, generally possess virtues that are conducive to the acquisition of property. But they are also prone to vices that the poor are much more resistant to. The rich are arguably
more in need of evangelizing than the poor, since their souls are in greater danger.
As for your kids, it's laudable to be very picky about who their friends are and what sorts of influences they are exposed to. Some of the best people I know are super Catholic families with 6+ kids and a stay-at-home mom. Those households make a lot less than mine does each year, but they've chosen that sacrifice for noble reasons, and I have no concerns about what my sons will be exposed to when they go over to such houses to play.
In sum, virtue is good. And paying close attention to the moral formation of your kids is also good. But associating either of those things with class is a huge mistake.