The OP asked for suggestions on how to make our children more resilient, not how to ignore it restinggrinch. Your statement of
"Quite frankly if you are hurt by racist comments then you must have internalised the racism to an extent otherwise they wouldn't effect you. So long as you teach your children to judge others by their actions and their words and not their skin tone they should be just fine."
Essentially is saying that POC shouldn't be hurt by comments or actions and should toughen up. How do you tell that to a 3 year old dual heritage, say Caucasian- Malay who has been told by a Scandinavian heritage child that they look like a wolf because of their eyes? Or something like that? So we should teach our children that their colour will not dictate how the world sees them? Have you not travelled around recently? Ever been to the Netherlands, Germany, Poland, the Czech, as a family of Colour? Oh yes, all that "bad treatment" that you experienced as an exchange pupil had nothing to do with your Colour. It's all poppycock.
I think that you are the type of person, hopefully that my relatives will be able to discern as someone they don't need to have in their lives.
Teaching children that 'black is beautiful' , say if they live in majority white countries or say in Asia, is important as the world that they live in will Never let them forget that they are not the majority race. Teachers, employers, police, etc etc etc will not treat them equally to say a Caucasian, it has been shown in numerous studies that POC receive poorer quality of services in health, education, law, etc etc etc. Thus obviously unless my PhD is void, better inform Imperial their life expectancy and outcomes are directly affected should I draw you a simple positively correlated graph?
The saying 'black is beautiful' is not to say that white, latino, Asian etc races are not (if that is what you are offended by), but Caucasian heritage is celebrated vehemently in media, literature, art and history. African diaspora history and culture has been nearly eradicated from the curriculum in Europe and Latin American schools and universities (aside from the specialist institutions dedicated to such them).
Also,
"Your race is your body, not you. You are not your body but rather what you do with it. The whole black is beautiful/white is beautiful thing is superficial. Your body is not beautiful. It is attractive or aesthetically pleasing but it's just a thing. It's not enough on its own to be beautiful. The things you do with it are what makes your body beautiful. "
Try telling that to Alexandra Schulman the previous editor of vogue. Her magazine would clearly disagree with your statements on many levels. Her magazine would agree with your statements for black and South Asian models, and definitely not Caucasian models.