Derek Sloan's aspersions are not racist and sexist - unfortunately

Derek Sloan is an idiot. A political neophyte who believes that he was called by God to be a Conservative, he is unlikely to become leader of the federal Conservatives later this year. As a non-Conservative, I can almost wish that he did win the Conservative Party leadership because he would be so spectacularly bad. His recent comments about Canada's Chief Public Health Officer, Dr. Theresa Tam, are puerile and ill-considered. What they are not, however, is racist and misogynist. I almost wish they were.
What Sloan actually tweeted was:

Dr. Tam must go. Canada must remain sovereign over decisions. The UN, the WHO and Chinese Communist propaganda must never again have a say over Canada's public health.

He also asked in the accompanying video, "Does she work for Canada or for China?"
Now, it seems incontrovertible that China delayed, manipulated and falsified data about the initial outbreak of COVID-19. That's what China does. But it's a big stretch, and entirely unproven, to say that the UN and WHO massaged the data and their message out of some inexplicable desire to favour China. The WHO needs to maintain relations with China, of all countries, because that is where so many of these kinds of epidemics originate, and it needs to do so any way it can (even to the extent of ingraciating itself). Any relationship with China and its health authorities, however tainted, is clearly better than none.
And it's even more of a stretch to say, after the events, that Dr. Tam should have had the foresight and downright precognition to know how things would turn out, and to totally ignore what the WHO, the respected but severely underfunded and underpowered world health authority, was advising. Canada's ability to come to its own independent conclusions on international health threats has been severely depleted over the years, for example by the gutting of its Integrated Threat Assessment Centre during the Harper years, and the withdrawal of a direct presence of the Public Health Agency of Canada from Beijing later in the Harper administration. (Donald Trump did the same thing with the American presence in Beijing, just months before rhe pandemic struck.)
However, much as it pains me, I have to agree with Sloan when he says:

None of my arguments for Dr. Tam's removal were based on her race or her sex: they were based on her performance.

The many calls on social media to shut him down for being racist and sexist are spurious. Just because Dr. Tam is female and born in Hong Kong (although raised in England) does not automatically make any criticism of her sexist and racist. This is just an attempt to shut down the debate by playing a card against which there is no acceptable rebuttal (because to argue against a claim of racism is, in itself, a racist act in some circles).
I have made this argument several times before (just one example), but it still keeps happening (do these people not read my blog?!) It is one of the hallmarks of the current climate of excessive political correctness (note that I say "excessive" political correctness: there is nothing wrong with political correctness per se), and it is unfortunate.