Is the roadrunner tactic fallacious?

In example number one, it is person #2 that is setting person #1 for circular reasoning by asking the wrong question. As person number one, my response would be "describe a better way." Of course, person #1 poorly phrased the statement because reality can be defined any way if we don't use science. For example, I can argue that reality is a world where invisible unicorns control our minds. If I reject the scientific method and assert that my "knowing" is the best way, I have created a self-sealing argument ;—if we are not using evidence, than evidence cannot refute my claim. In sum, it is fallacious, but the fallacy rests with person #2.

As for example number two, this is the concept of self-refuting ideas. Using philosophy, one can argue either that the idea is invalid because of the self-refutation or a necessary axiom and therefore valid. These debates have been going on for thousands of years. See the wiki link for more details.