I usually see an argument along the lines that satellites are put up there by rockets that shut down before they leave the atmosphere. The fact that achieving a closed, stable orbit requires an impulse to be performed in vacuum is simply too esoteric for them; appeals to Newton's Cannonball usually go nowhere.
Presuming there's any sort of coherent thought involved, this might be mixed up with the idea that gravity stops once you're "in space", so all you have to do is get high enough.
And SpaceX is
really close to bringing the Falcon 9-R first stages back to a landing pad for reuse, and plan to do the same for the next version of the Dragon capsule, so there'll ongoing examples of the same sort of thing. That won't stop everyone though...every time a new Grasshopper test is done, there's cries that the video was faked. Some of them are certainly just trolls, but it's hard to tell the difference between them and the real thing...