Some take every opportunity to make points at someone else's expense while others never do anything at someone else's expense if they can possibly avoid doing so.
Two ends of a pole. What izzit exactly that prompts the "some" to do that and the "others" to try to avoid doing it?
Nasty nice? I dunno. Beats me. Whether I encounter it personally or observe it from afar I always wonder why that is the road/path they chose and not another one? It happens. Everyone says so. That I can tell you.