The notion of disrespect belongs to old-style style values and cultures. To the extent that this concept still remains today it has been inherited from the past. Of course what made more sense in the past is that both parties who encounter each other would have very similar notions about respect -- that is, the people who encroach on another's space would also have the internalized sensation that what they are really doing is actually disrespectful. It wouldn't just be just the one party who feels this way. Nowadays, people tend to just walk around and "be themselves". These are the modern values. If others happen to feel that their behavior is disrespectful, nobody cares about that. People are free to do as they please. Therefore, some of us have to make very long and troubled journeys toward modernity.
In the mean time, Western cultures seems to be going through a trial-by-fire, where the extent of entitlement and having the right to do just as one pleases is being tested. People may learn that not reciprocating kind actions, or not investing in some of the old-fashioned values leads to being left high and dry when their luck runs out and nobody gives a damn about them. At that point there might be a shift in cultural norms, when people come to wonder whether having respect and showing respect might be worthwhile cultural values after all.