Why does Lorraine's mother not want her at Stryker's Luncheonette in The Pigman?

Lorraine's
mother does not want her to go to Stryker's Luncheonette because she is afraid that she will get
in trouble with the boys that hang out there.

Stryker's Luncheonette is a
favorite place for the teenagers in the area to gather. When Lorraine's mother asks her where
she went after her drama-club meeting, Lorraine tells her,

"I had a soda with the kids afterwards at Stryker's Luncheonette."

Lorraine's mother gets upset, telling her daughter,

"I don't want you going in there. I told you
that."

When Lorraine responds that

"All the kids go there,"

her mother comes back with the retort,

"I
don't care what all the kids do. I don't want you in there. I've seen those boys hanging around
there, and they've only got one thing on their minds" (Chapter 6).

The "one thing" that Lorraine's mother is speaking about
is, of course, sex. Lorraine's mother is obsessed with the idea that men are evil, a reaction
most likely to the fact that her husband left her when she was pregnant with Lorraine. Lorraine
reads into everything her daughter does, imagining improper motives and behavior in all her
relationships. Even in regards to Mr. Pignati, she is blind to all the real and important
elements of her daughter's interactions with the old man, and only wonders if the Pigman has
tried anything inappropriate with her.