I would say that that doesn't really violate the spirit of the rules, but it definitely violates the letter. It wouldn't be something to make an issue of to other players, but name them back and just don't do it anymore to be on the safe side. 
EDIT: Just name the units back to what they were or default or something. Nothing that's intended to convey a message of any sort.

EDIT: Just name the units back to what they were or default or something. Nothing that's intended to convey a message of any sort.