jacitell, why compare a literal (renaming French Fries) with a figurative ("pissing on the graves..") ? it just makes you look like an idiot.
That said, there is a difference, but it's only one of degree. This Bayeux action was not governmental (at least, not nationally so), unlike the renaming of French Fries, which was undertaken by the US congress.
The point remains. If the US cannot take an insult against their nation and countrymen, maybe they should not be so quick to dish one out.