Aye luna, exactly. It's not banter for anyone with basic maturity and I'll tell you for why.
I'm sure everyone knows there's no one style of gay men - hard men, camp guys and the only thing gay men have in common is they are attracted to men. That's the only thing that makes them gay. So unless the homosexual community has added a caveat of eating magnums without me being privy to this information - but, inexplicably, making richard hammond aware - then Hammond is effectively stereotyping gay men. He, as a maayyyn's maaayn, a proud heterosexual, would not be seen doing something so fey, so fluffy, so camp as...eating a magnum.
It's just bullshitty, it's not funny, it would be almost offensive to the gay community if it weren't such a pathetically stupid comment - but it's definitely a negative comment which should not have been made.
If this is banter, Britain deserves better banter.