His claims about not knowing anything about the ethnicity of the child are not believable. A newborn who can't defend themselves is not fair game for derisory jokes.
I think that the first sentence is the nub of the issue. Is it the responsibility of citizens of this country to (a) know about every offspring of minor members of the royal family and (b) know about the ethnicity of every offspring of minor members of the royal family ? And then to remember them at some distant point in the future.
Yes, perhaps in the early days of 'the pregnancy' I might have (accidentally) read something about it, but I had completely forgotten by the time the sprog was born because (a) I'm not interested , (b) it matters not one jot to me and (c) I have a life.
Whilst I know very little of Baker, I can give him the benefit of the doubt because perhaps his attitude is/was exactly the same as mine. I wouldn't have done the chimp tweet though , because I can do no better parody of the royal family than they do of themselves. I think a constant awareness of all matters pertaining to all aspects of the royal family is a little bit too much to expect of citizens ; obviously, I am not worthy.
This common 'newborn who can't defend themselves' statement is bizarre. I am completely at a loss as to how people think that Baker's tweet had anything to do with a personal attack on the baby at all ; 100% about the family and system it is born into. But 2019, you know, people do like to find things to take offence to.