Agreed, but we should demand similar civility on all fronts. We have that right as well.
A dwindling fraction of the population even recalls Jim Crow, much less slavery, and I won't even get into the myriad misconceptions summarily perpetrated about the latter.
If we are indeed ever to become unhyphenated Americans again we need to make a clean break, not give one group a pass, which only creates fresh resentment.
We certainly have a right to voice our opinion.
It also might be all right to give this one group a pass—not on calling other people names but on using language that has its own meaning for them as they like, and not acting as if that were a pass to use the word wrongly.