In what way does Fitzgerald indicate that Myrtle Wilson is not an intellectual in The Great Gatsby?

Within the setting of Fitzgerald's novel, the 1920s, there
was in the United States a definitive class system.  At that time, only the weathly were
able to attend college, while most of the citizenry went to work right after graduation
from high school, or even sooner.  As the wife of a mechanic who lives in the less than
desirable Valley of Ashes, on the "edge of the waste land," Myrtle Wilson is clearly
placed in a social stratum separate from the
Buchanans. 

While she aspires to a life of wealth with Tom,
proud of the material gifts such as the expensive collar for the little dog that he buys
her, she does not conduct herself as any intellectual would.  When, for example, she
changes her dress at the New York apartment, Myrtle's "intense vitality" at the garage
has transformed into "impressive hauteur."  Her gestures and speech--"the room rang
full with her artificial laughter"--are affected as Myrtle puts on airs. She haughtily
speaks as though she is above the workers at the
hotel:

"I told
that boy about the ice."  Myrtle raised her eyebrows in despair at the shiflessness of
the lower orders.  "These people!  You have to keep after them all the
time."

Unlike a lady or an
intellectual, when she moves, Mrytle carries "her surplus flesh sensuously as some women
can," Nick comments.  She is earthy and vital, petty, and jealous. As she speaks with
Nick, she describes her intense sexual attraction to Tom Buchanan. Further in the hotel
scene, she openly disparages her husband. Also, Mrytle jealously shouts Daisy's name
after being told by Tom that she has no right to say her name until Tom brutally hits
her, an action that points to Tom's not being an intellectual, either.  That Myrtle acts
upon emotional urges rather than rational thought is finally evidenced by her rushing
madly to the Gatsby's car that she mistakes for Tom's as it speeds by Wilson's
garage.