Identity of "that awful boy"

[Brenwen]

No: HPFGUIDX 183093

I was re-listening to OOP last night, and in Chapter 2, as the Dursleys
question Harry about Dementors, Petunia replies to Vernon's query -
"What are Dementors?" by saying, "They guard the wizard prison,
Azkeban." At this point Harry, dumbfounded, asks Petunia, "how do
you know that?" and she replies, "we heard about it from that awful
boy". (This is not verbatim as the book is not in front of me).

I always believed the "awful boy" was James Potter who was either
dating or married to Lily.  But now, upon reflecting about post DH re-
reads, I believe she meant Severus Snape.  In the Pensieve memories, he
spends time with Lily telling her all about the wizarding world, and
they are often observed by Petunia, who feels left out and, therefore,
hates Snape.

Brenwen