You're a pretty young kid, so lets not crucify you for the original post too much, but what you said was really immature.
First, these people are out there at their kids games, on the sidelines, taking pictures of their kids. Lets applaud them for that, not deride them for that. Whatever it is they're doing right or wrong, they are clearly making an effort to be a caring, supportive parent, which is way more important to our society than knowing the ins and outs of your D5100.
Second, between being parents and having full time jobs and perhaps spending whatever small amount of time is left with their spouse, they most likely simply don't have the time to learn about photography. They're not an unemployed kid, they're grown ups with grown up jobs.
Third, it's doubtful that they bought their dSLR as a status symbol. There are MUCH easier, better recognized status symbols than beginner dSLRs. They likely went to a store and asked a salesman what would help them take the best pictures of their kids possible. Again, being a grown person with grown person time commitments probably precluded them from putting much of a time commitment into it.
Fourth, do you not see the irony of how judgmental, superficial, etc you are being? You seem to be judging these people's character solely based on a camera they have around their neck and the fact that they aren't experts with it. If you must judge a person at all, judge their individual character based on deep interaction with them personally. Don't make sweeping generalizations based on extraordinarily brief, superficial observations.
Again, I understand you're a really young guy, but if you don't walk around judging everybody so harshly and being jealous of things they have, life is a lot easier. And photography is a lot easier when you focus on the gear you have and what you can do with it instead of what everybody else has and how well they can or can't use it.