Dumbledore's courtesy (was Re: Petunia)

[esmith222002]

No: HPFGUIDX 114123

'During the Edinburgh Book Festival Q&A JKR states the following, 
regarding Petunia: "No, she is not a Squib. She is a Muggle, but..." 
then she trails off onto some other tangent.  She is a *Muggle* 
according to JKR.  Straight out of her own lips.  A "Muggle*'

What confuses me in all this is Petunia's howler. Dumbledore actually 
calls her 'Petunia'. The feeling I get from the books, is that DD is 
very old school in manners. If DD is talking about soemone in the 
third person, he will always refer to them by their correct title 
e.g. Always admonishing Harry for not giving Snape his correct title. 
However, when he speaks to people directly, he will always use their 
first name e.g. Harry, Severus, Cornelius etc. The only example I can 
think of where DD has spoken directly to someone and used their 
correct title is Madame Maxine - which shows how polite DD really is. 
My point...finally....is that I do not think DD would address Petunia 
in such a way unless he knew her. If they had never met face to face, 
he would have called her Mrs. Dursley. So the question is 'When and 
where have Petunia and DD ever met previously.