Diane, I'm asking your advice as a North American:
I have a cartoon which features neighbouring bitrds nests.
One nest has been "improved" by the addition of another storey and the occupants of the other birds nest are peed off about it.
The wife in the second nest is admonishing her husband: "right up themselves" or not, just let it go, Ralph".
Is the phrase "right up themselves" one which North America recognises as meaning people who are snobs or superior? I'd appreciate some help with that.
I'll post the cartoon later, I have to go out for a curry.