Far too many people (myself included) don't detect racism unless it's really overt. The dialogue is delivered at a fast pace, with a lot going on on screen (multiple chat windows open, I ignored the ones that weren't speaking, the rest got lost in a flood of "Linda's friend list" at the periphery of my awareness). That particular line... yeah, she had no reason to expect it to be the same person.
The signs are there, but they're well-disguised if you're not wired to look for them. Mind you, I'm one of those people who saw "Song of the South" as a kid and got a message of "Respect other cultures and listen to their stories", completely missing the stereotypes (the kids are helped by listening to Remus' stories, not by their parents), so I'm not the most microaggression-aware person.
If it was real life, it’s the sort of thing I would notice no problem. But here it’s being deliberately hidden because of its presentation. For example, I’m look(ing) at Ncuti being The Doctor. So I am looking for peoples reaction to the character, (not ) his ethnicity. I’m being shown a vapid self-centred character in Lindy, so I am not going to notice anything like the racism because I am not even necessarily assuming she is even human.
Hidden too well to make its point.
(edit, as had to go answer door:
This how the Doctor deals with Racism:
Why has that changed? Why isn’t the Doctor calling it out? Why isn’t Millie?
Clumsy. Serves fable, but not the character, serves the writer but not the show.)
(Extra edits to fix my bad typing at the time in brackets)
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