Yes I discriminate.
Lets assume poors/minorities are equally as likely as anyone else to accuse you of something improperly (although that's probably a poor assumption, as those of higher social class tend to have better access or confidence to access formal government systems, especially when you consider things like illegal immigrants probably won't approach police under any conditions).
Now imagine thye go to police, or to the court. Which parents do you think garners the best odds and rapport with the legal and enforcement systems in the US:
1) The black factory workers
2) White single mom in the trailer park.
3) White business owner of the local dentist office.
The legal system discriminates. Then I pick to minimize my chances of being the victim of a discriminating legal system. Sadly there's not much chance the cops are going to believe the black factory worker or trailer park mom in the place I lived, false accusation or no. Hell in that same city they shoot black guys just for having a CCW and telling the cops they're legally carrying. I simply had nothing to worry about.
The axiom that the rich tend to get away with more in the US is sadly a true one. The other end of that is that the rich also tend to be able to garner much more social capital to pursue claims against you, whether they are true or not. My fear is not so much the false claims alone (which can come from anyone of any race/class), but people who may make a false claim and also be on the upper end of the spectrum of holder of social capital to actually execute that claim.
My risk tolerance being what it is, I could choose to ignore ALL children and thus not discriminate. Instead I choose to discriminate and will engage children if I think that someone who makes some bogus claim won't be taken seriously by the justice system. If the justice system / police treated poor blacks as well as affluent whites, I would choose to not engage children at all ever. If this makes me a bad person, so be it, but it's a measured response to the sad realities we live in.