The whole ‘if you don’t like MM you’re racist’ is profoundly ignorant
This particular strawman argument gets raised alllllllll the time and I think it shows when posters are not engaging in good faith, and it seems designed to paint people in a bad light and as racist.
Why? Because it simply is not true.
Never, not once, have I ever seen anyone say "if you don't like MM you're racist." Literally not once. People claiming that are just making up lies, and when you challenge them to produce even one single link or screencap so where someone has said "if you don't like MM you're racist" they never can (and usually that username vanishes only to be replaced by a new username spouting the same crap). And when posters feel the need to make up lies, I can't help but question their motive.
What I have seen, fairly frequently, is posters denying that Meghan experienced any racism whatsoever, denying that there's ever been a single racist news story or headline, and denying that there's ever been a single racist comment posted on mumsnet which is frankly Orwellian.
Perhaps it's not intentional lies, perhaps it's being oversensitive, and taking discussion of racism too personally, in which case okay rather than repeat untruths why don't we discuss what's actually been said?
Far from "anyone who dislikes MM is racist", what's actually been claimed boils down to this: that the hatred towards Meghan is predicated at least in part on both conscious and subconscious racism, and that it's not possible to separate out the racist treatment and coverage Meghan's received from her overall treatment and coverage. There have been both overt and covert racist slurs in the press, and a huge amount of online and social media comments have been horrendously overtly racist to the point of literally calling for HM&kids' deaths and with frequent use of the N word and other racial slurs.
If we're talking specifically about mumsnet, not only have many Meghan threads contained outright racial slurs or used coded racist language, but some of the posters who are the most vocal and impassioned in their hatred towards Meghan (some of them racking up hundreds of thousands of really quite astoundingly vitriolic posts over the past the six years) are pretty notorious for being racist or goady in non-Meghan threads. There's also a lot of abuse towards posters who aren't white including being called racial slurs, microaggressions, and tone policing.
If someone genuinely can't tell the difference between "anyone who doesn't like MM is racist" and "the fact some press coverage and many mumsnet and other online comments about MM have been overtly racist or from people with a proven history of racism proves that racism is at least one facet behind the hate campaign" then that's quite a substantial lack of critical thinking skills, and we're not responsible for that.