The perps could be...
--nutball Ron Paul operatives
--legitimate GOPers lacking good judgement
--legitimate GOPers lacking good judgement, and partaking of drink
In any event, failure of the story to develop further indicates it wasn't much
to begin with.
Black people are overly sensitive, in some cases perhaps from a position of being watchful for situations they can exploit for benefit.
Consequently, right or wrong, many whites bend over backwards to avoid anything that could be remotely construed incorrectly when dealing with blacks.