Sir,
I don't think it is either a simple miss or a prejudice. If you strongly believe in something, and then look for evidence to support that, you can find a plenty- it is called selection bias. That's why most research have to start from an unbiased sample, to the extent possible.
Anyways, coming back to this case, truth can be found only by digging a bit deeper. Which I did. Shotgun shooting is not an olympic sport. In fact, its world cup is held separately from other shooting world cups, governed by the ISSF, the governing body for shooting. You can find the info here:
http://www.issf-sports.org/theissf/championships.ashx
Now it so happens that the media just gives more attention to the olympic shooting events. Indian media is not alone in this, though it would be more extreme in giving prominence to those who win in olympic events, given our abysmal records in olympics, asiad, commonwealth, etc. The championship is being held in UK- yet I have not read about it anywhere in the media here. Seema Tomar is not the only one who was not given prominence by the media. Ronjan Sodhi not only won the gold, but also created a world record. Though you can find these news in the papers, but they are not being covered prominently. It is indeed sad for the athletes. But such examples would be dime a dozen, from all over India.
The second point that conclusively defeats your theory is contrary evidence. The likes of Vijender Singh and Saina Nehwal have been feted and celebrated like anyone else. In fact Vijender Singh who won a Bronze has been celebrated much much more (appearance in TV programs, celebrity events, etc.) than Bindra who won a Gold. Can Bindra's caste use that argument to show how media is favorably biased to Jats over them? No, because Vijender got all this limelight as he is more of an extrovert and chose to be in limelight unlike Bindra.