Why does Squeaky get bothered by people like Cynthia Procter who pretend not to practice in "Raymond's Run"?

Squeaky doesn’t like people who show false humility, pretending things come effortlessly to them.

Squeaky works hard for what she accomplishes.  She practices running, studies hard in school, and usually succeeds at what she sets her mind to.  She does not appreciate it when people like Cynthia Procter pretend that something comes easy to them when they in fact had to work hard at it too. 

Squeaky uses Cynthia’s practicing the piano as an example.  She sees Cynthia practicing, so she knows she spends hours at it.  Yet Cynthia likes to show off and pretend that she can effortlessly play the piano without ever practicing.

Then in music class she … falls accidentally on purpose onto the piano stool … just for fun to try out the ole keys.  And what do you know—Chopin’s waltzes just spring out of her fingertips ... I could kill people like that.

This irritates Squeaky, because she doesn’t like show-offs and people who pretend that they don’t need to work for what they accomplish.  False humility—pretending you have humility when you are really showing off—is the worst form of arrogance. 

After the race, Squeaky is still considering Cynthia and comparing herself to Cynthia, even as she realizes that Raymond would make a very fine runner.

[Even] if I’ve won, I can always retire as a runner and begin a whole new career as a coach with Raymond as my champion. After all, with a little more study I can beat Cynthia and her phony self at the spelling bee.

Squeaky has found a new way to exist with Raymond, and understands that with enough hard work she can accomplish any task she sets her mind to, including helping her brother Raymond become a champion racer, because Squeaky is the real deal, and she puts one hundred percent passion into everything she does, and so does he.

Why does Squeaky dislike Cynthia Procter in Toni Cade Bambara's "Raymond's Run"?

Squeaky, in "Raymond's Run" by Toni Cade Bambara, works hard for everything she gets. She practices her running skills and works on keeping herself in shape even if it embarrasses her mother. Cynthia Procter, on the other hand, pretends that she doesn't even think about practicing, whether there's a spelling bee coming up, a test, or a piano recital. Squeaky can't stand that Cynthia Procter is a big fake.

But of course when I pass her house on my early morning trots around the block, she is practicing the scales on the piano over and over and over and over. Then in music class she always lets herself get bumped around so she falls accidentally on purpose onto the piano stool and is so surprised to find herself sitting there that she decides just for fun to try out the ole keys. And what do you know--Chopin's waltzes just spring out of her fingertips and she's the most surprised thing in the world. A regular prodigy. I could kill people like that. (Bambara 2)

Squeaky is honest and does not like it when others are not. She stays up late studying, and she'd rather run than walk, so that she can continue to win races and to be her very best.