For what it's worth I don't think you have anything. But if Frost or his staff have done anything racist, air it out. If not, don't make the accusation, or go along with it.
I think this person on Twitter (and you to a certain extent, by reposting it here and seeming to believe it's true) was doing the typical thing where they vaguely accuse someone of being racist without being able to back it up at all with evidence, and then when called out on it, act like it's not that big of a deal. It is a big deal. It can ruin a person's career (which I'm sure is the whole goal). But it's also harmful to minorities in that it waters down the accusation of racism to the point it longer means anything, and we have a boy who cried wolf situation where actual racists get to hide in the shadows. Let's not do that.
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