We've all known people who are poor losers.  Get beaten in any game, and they pout or throw things, make excuses and blame everyone except themselves.  If their friends don't ban them, eventually those same players will win at something. Surprise, they are also poor winners, strutting and bragging, disrupting the game.  Politics is a lot like that, except the childishness is very surprising in those apparently adult. 
Republicans acted like spoiled brats when Barack Obama won his two elections, and pouted for eight years.  Now they have won, their behavior is just as bad.  They taunt and boast and tear down, taking every chance to dismantle a government by and for all the people.  Eventually the cycle will turn and they will lose badly, even though they won't believe it now, and their behavior will come back to bite them.