There is no constitutional right not to be offended.
There is a constitutional right to be offensive.
I don't think the US Government should be intervening.
If a business wants to be known by a racist name it should be their right to do so. I know of no constitutional basis for denying a business such a name.
In fact, if groups that were offended by such names had a lick of sense, they would trademark them out the wazoo and thus keep others from using them.