Everyone knows that Cameron Tucker likes to be the center of attention.
So he was not impressed by "that pathetic peacock of a man" who came back from sabbatical on Modern Family Season 5 Episode 16.
Most of the characters were doing a little peacock-ing on this latest installment. Since there are a couple of definitions for this out there, let's go with number-five on Urban Dictionary: when someone is blatantly obvious that they are proud of something.
For Cam, there are a ton of things he is proud of: his planning skills, his fashion choices, his dancing and his ability to be the center of attention. Senor Kaplan was a clone of Cam.