Mnemosyne wrote:
As has been mentioned it it a derogatory comment flung at people who get drunk quickly, cannot hold their drink/have low alcohol tolerance. The 'lightweights' comment made me think Lestrade was just being bitter over not being invited to the stag-do/pub crawl. Also explains why he screamed in John's ear whilst he had the mother of all hangovers. In this case it is Lestrade who is acting like a child (despite repeatedly insinuating that out of the two of them Sherlock is the childish one.)
Oh, I didn't clue in to any sense of childishness on Lestrade's part. I also didn't see it as derogatory, just more as teasing. I thought it was just one macho man taking a poke at a couple of other macho men, a seasoned cop teasing a couple of blokes who should have known better than end up in the drunk tank. I guess I took it more at face value, not being a guy and all. ??