Your contemporary leftist doesn't need any excuse to be offended. His worldview is to take offense at everything, but he doesn't realize that in doing so he is making himself an offense to his neighbours.
Who's offended? The latest polls show that both Sanders and Clinton out front of any Republican candidate. Romney just came out loudly against Trump. The Republican party is currently in chaos. All is well.
Conservatives get extremely offended when liberals say state funds shouldn't be used to promote private religious organizations.
Liberals get extremely offended when Conservatives say there is no problem with nation wide occurrences of unjustified police violence against unarmed civilians as long as they are people they can label as "thugs".