The EU wants the exit to take place as quickly as possible to avoid further chaos. The longer the exit lasts the more toxic it becomes. France will hold presidential elections in 2017 and Le Pen has said she wants a referendum for France. If the EU doesn't make it clear before than that leaving the EU has undesirable consequences and pushes French voters to elect someone other than Le Pen than the EU is finished.
The EU seems ready to accept any statement by the British in order to claim that notification under article 50 has been delivered:
"The European Union has clarified the way the UK can kickstart formal negotiations to exit the bloc following Thursday's referendum."
"It says Britain can trigger Article 50, which sets a two-year deadline for a deal, by making a formal declaration either in a letter or a speech."
Brexit: EU spells out procedure for UK to leave - BBC News
The EU wants them out now and will look to any justification to do so.
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And there you have it. Confirmation that The EU is all about bullying and threatening. Even trying to interfere in national elections. May I please have your permission to forward this to Ms. Le Pen? I'm sure it would be helpful in convincing French voters that the change in national leadership has to come quickly if their freedom to vote in/out is to be maintained.
Yeah, because the UK, or any other nation, has never done that.
You flipped off the EU, and now you are complaining because they want you out even more than you want to leave?
This is how it works dude. The EU has been fighting to keep unity for several years now, and you just slapped them in the face with the biggest 'screw you' vote since the EU was formed.
Now you expect them to be happy and friendly as you leave? I'm not sure what you expected the reaction of the EU to be after spending 5 years trying to hold the EU together, only to have the UK suddenly and abruptly vacate, but your expectations are unreasonable.
Not don't get me wrong. I don't know if leaving the EU was good or bad in the long run. But spare me this complaining and moaning about how the EU is taking this badly. You should have known from the very start, that leaving the EU would have consequences, and that you were going to make a ton of people extremely upset. You made that choice, so buck up and take it, and stop whining about it.