Well, a quick search says
that's not true ....
Looking through the first page of those search results, they are all discussing some sort of political point, so not really an offensive use of the word. I guess I would modify my statement to say that any post containing a racial slur
used as an insult would be so offensive it would be deleted. But I'm a white man in a majority white country and have never had anything like that word directed at me, so I don't know how offensive some people might find it even in the context of a political or academic debate, or as a deliberately provocative piece of language used to make a political point. To my mind it's not words that are offensive, but the attitudes behind them that the use of the word betrays.
I tried to do a search for the c word to do a comparison, but it wont allow searches of censored words.
Daffodil turns up 31 pages but a lot of those are about actual daffodils and I don't know if the search function includes the filtered version of censored words.