In "Ex-Basketball Player," what is John Updike's attitude?

What do you mean by attitude? You might find it helpful to
expand on this question and make it more specific? Do you mean what attitude does Updike
have about Flick Webb and his situation in life? I think we can clearly infer that
Updike feels great sadness for Flick Webb, who, like Pearl Avenue, has started off with
so much hope only to be curtailed suddenly:

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Pearl Avenue runs past the high-school
lot,

Bends with the trolley tracks, and stops, cut
off

Before it has a chance to go two
blocks...

The geography of
the streets matches the trajectory of Flick Webb's life: both are "cut off" before they
have a chance to go anywhere. In addition, you might like to consider the way that
Updike presents Flick Webb as a character who is haunted by the ghosts of his former
victories, which is made all the more poignant by the way in which his current life is
so devoid of success, meaning or purpose. Consider the last three lines of the
poem:

Flick
seldom says a word to Mae, just nods

Beyond her face toward
bright applauding tiers

Of Necco Wafers, Nibs, and Juju
Beads.

The way that the
metaphor in these lines is used to compare the tiers of candy to the "bright applauding"
bleachers of his former matches creates a pitiful picture of a man who cannot reconcile
his early success with his present mediocre existence.