The poster contains all the necessary words, just in a different order: "Like", and "we need your support". As I said in a previous commentary to the NY Times article (“The Island Where People Forgot to Die”), it is the meaning, the metacommunication that occurs beyond the verbal what matters the most. The fine line between humorous and offensive creates a sort of adrenaline rush. I believe that sarcasm, in its most complex forms, creates a psychological double bind and psychological tension. Depending on circumstances, this tension will be released either toward anger/aggression, either toward a relief, a relaxation.
Part of my work (www.synergiscounseling.com/anger-coaching) is to help clients identify (real or perceived) psychological double binds. They can be present within any social system: work environment, group of friends, family, couple relationship, community, nation, etc. In fact, since we are in the middle of it, politicians use very often psychological double binds to push the voters in the desired direction.