He strutted around like an arrogant douchebag, thinking he was better than everyone else.
His obnoxious behavior made him a real douchebag to be around.
She was such a selfish douchebag, never thinking of anyone but herself.
His pretentious attitude made him come across as a real douchebag.
He was constantly talking over everyone, making him an annoying douchebag to deal with.