Just a bit of background. In times gone by, when we were conquered by the Normans, they tried to ban the use of Anglo Saxon. Using it in public could be punished by death. Obviously the natives continued to use their own language for personal matters, but even this had to be done surrepticiously. This is the origins of "swear words". (words that may not be uttered in public).
The trouble is, no matter what word we think of to represent the colour black, sooner or later, someone will apply it to the description of a group of people, and it will that too will become unacceptable in public.
In the days of William the conquerer, there was good reason not to rock the boat, (death can be pretty fatal!). These days the repercussions are not so intimidating. It's about time we showed some of the spirit of our ancestors and took back control of our language.
Why the heck, should we let foreigners dictate what parts of our language are, or are not, acceptable? If our language was that unacceptable to foreigners, it wouldn't have become the most successful on the planet.
BTW I know there are dialects of chinese that are spoken by more people as their first language. But in terms of numbers of people that can understand the language (non native speakers included), English still Rules!
Don't let the PC brigade succede where the Normans could not. It may still be called the Queens English but, even the compliers of the Oxford Dictionary accept that the language is effectively owned by the people. New words and new meanings for existing words, are introduced every year. The only criterion for a word (or meaning) to be included, is that it has already been recognised by US, the people. This is how the language has become so great.
If we all continue to use the terms "Blackboard", "Manhole covers", "Fireman" etc.. we will never be defeated. I, for one, will continue to tell the story of Snow White and the Seven Dwarfs to my grandchildren. I urge you all, not to bow to the thought police. Once they realise that they are being ignored, they'll just give up.