Hmmmm. I'm not so sure. If he has decided that is better for France not to expand the EU, and he wanted to strengthen the anti-EU movement in Eastern Europe, then maybe this insult was successful and quite intentional.
With the French it is always important to remember that they are utterly machievelian. They have no honor, no scruples and no shame. They are perfectly willing to loose "face," to be embarassed, or to be perceived as fools or as cowards (or to keep millions of Iraqis under murderous, dictatorial oppression) so long as it increases or preserves their real power.
Great point. It is entirely possible that this is an act of sabotage. Of course, if it is, it had better work. Because if it doesn't, France will just have pissed off a whole bunch of new EU members.