Because Bristow is an ex-sportsman and thus a minor celeb he has a greater reach in who his tweets connect with and thus his views are more likely to spread a lot quicker than any you or I would send. A prime example of not thinking before you air you views in cyber space.
Because there is a huge difference between some non-entity troll in a bedsit in Kettering with half a dozen followers and a sportsman who has some national media presence. The latter has a far greater reach than the former and thus needs to be a bit more responsible in what they say. You appear...
But what about the people he was tweeting about? By putting it in the public domain there is a chance they will pick up on it, unless of course you are quite happy for someone to publically call you a wimp because you didn't act a certain way when you were 13.