I'm talking about the initial presumption of racism. I've since changed my stance in light of new evidence.True, but that doesn't mean that this individual person was doing it for a racist reason. There's no way we can know that without getting into his head. Maybe not without entering into his unconscious, even. There is no other evidence, that we know of, of him being racist. So you either take his word for it, or you don't.
IMO the fairer course of action, which reflects a more positive view of human beings, is to take his word for it, given what we know. I would hope that if I ever made a stupid mistake, other Spurs supporters would adopt that attitude towards me.
But at the time, what else was there to think but associating a banana on a football pitch as racism.