Sherlock is probably the most childish man I have ever seen. He whines when he is bored, he shoots his gun at the wall... He always bothers John!
But as Sherlock, he has handfuls of big insults. For instance 'I hate being outnumbered, it makes for too much stupid in the same room' or 'Turn around, you're putting me off!' And even 'BORED!' Is an insult to many people.
It may seem bad, but to think like him, you should have some insults in your pocket.