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"I told that boy about the ice." Myrtle raised her eyebrows in despair at the shiftlessness of the lower orders. "These people! You have to keep after them all the time."
She looked at me and laughed pointlessly... (2.69-70)
Myrtle thinks that acting like a snob makes her sound fancy—but it just makes her sound even more like herself: a vulgar, common, cheating woman. You're not fooling anyone, honey.
"You see," cried Catherine triumphantly. She lowered her voice again. "It's really his wife that's keeping them apart. She's a Catholic, and they don't believe in divorce." Daisy was not a Catholic, and I was a little shocked at the elaborateness of the lie. (2.98)
It's an elaborate lie, but it probably never even occurred to Tom to tell the truth. He seems to hold one standard for people like Gatsby, and another for himself. It's fine for Tom to lie to get a girl, but not for anyone else.
Some time toward midnight Tom Buchanan and Mrs. Wilson stood face to face discussing, in impassioned voices, whether Mrs. Wilson had any right to mention Daisy's name.
"Daisy! Daisy! Daisy!" shouted Mrs. Wilson. "I'll say it whenever I want to! Daisy! Dai –– "
Making a short deft movement, Tom Buchanan broke her nose with his open hand. (2.125-127)
Women have words. Men have fists. Guess who wins? (Hint: sticks and stones can break your bones, and … yeah. It pretty much ends there.)