One would hope that when you have left the school playground and entered the "real world", you have developed enough sense of empathy and social skills to understand the long-term benefit of treating people with respect, ie how you would want to be treated yourself. We do spend much time and effort drilling this into infants after all.

Those who don't, ie who find it ok to use/abuse others (or can't stop themselves) for personal profit/pleasure, I would term social freeloaders.

It's sad that this seems to extend to middle age in some people. And that grown-up institutions need processes to deal with problems that should have been sorted out in kindergarten.