gosh. its too feminine, if he thinks being a member of this site seems gay than that bag would make him a holy homosexual (im not trying to be offensive either)
With that color combo I'd say no, but like elongreach said, hes your brother, so if he wants to do that, then at least it'll stay in the family in case you ever want to borrow it..
i personally think it's way too feminine for a guy, even with the black and black combo, and i think chanel in general is a very feminine brand, maybe it's also because of the history of the house.
i think there are other designer brands that suite guys more, like LV, or Gucci, or Prada. But no, not Chanel!