Anyway, the attack of racism on Doctor Who would certainly be very true decades ago. Talons of Weng Chiang is the most obvious example, but there are others.
There is worse than that, The Ark
has some dreadful colonial racist politics underpinning it and The Celestial Toymaker
is just straight forward racist with its caricature of the Chinese and Micheal Gough hamming it up with his yellowface speech patterns plus the use of a version of Eenie Meenie Miney Moe that was problematic even during that time-period given what was happening with Civil Rights in the US.