It's like having a stinging-nettle in the house.
I believe--just because he's clever in his own line--that he's been spoilt.

As if everybody couldn't do something!" "Ah! That's the point," said Nick sententiously.

"Everybody can, but it isn't everybody who does.

Now this young man apparently knows how to make the most of his opportunities.

He plays a rattling hand at bridge, by the way." "I wonder if he cheats," said Olga.