But not Clanchy's own racism or classism. She's always right, and presented as the voice of reason.
To some extent this is true. The title gives it away, in fact: she positions herself as having been taught, and so her voice, looking back, does have a wry I'm-so-much-wiser-now! tone. I'm not sure it's fair to fault her for that, since a memoir about what you've learnt which didn't assume it was worth learning would be pretty lame. Also there are two important qualifiers: the first one is that she absolutely does present her own past arrogance and prejudices. Here's the scene with Shakila where they're taking about terrorism, and she says:
I'm assuming the poem is a protest against suspicion of Muslims in Britain. I'm aware there is a group of Afghans in the neighbourhood now. [...] I got into a discussion with [one of them] about the poet Rumi. He looked just like Shakila, come to think of it, so maybe--
"No, Miss," says Shakila [...]. "In England? There are no terrorists in England."
"She's from Afghanistan," says Lily, "she means the Taliban." [...] I assume this is a white stereotype, and I am about to correct her when Shakila nods, more vehemently than ever."
This whole passage is about the knocking-down of several assumptions - the cringey shorthand of thinking the guy "looks like Shakila", the self-righteous arrogance of assuming it's a "white stereotype". Of course she sounds smug, but that is entirely the point - she is talking about growing in self-awareness through being confronted by someone else's story and honesty. There are other places where you get a similar dance of evolving stream-of-consciousness, but this is the one I remembered enough to look up.
And secondly, she is entirely explicit about not being perfect now. As none of us are. (I refer you to the bit I posted before about prejudice and poetry, can't be bothered to type it out again.)
And finally - no matter how much we personally warm or not to her style, and how inclined we are to forgive her residual prejudices, I think she is doing her best to talk about the problems facing us, which is more than most people do. And for trying to do her best, she has been disproportionately punished, very publically. What message does that send?