A dictionary of Confusable Phrases: More Than 10,000 Idioms and Collocations

you can’t win • you can’t win ’em all
you can’t win —(also: you just can’t win) no matter how much
you try, there is no way to succeed: Even though we try to
educate everyone we come in contact with, sometimes you
just can’t win.
you can’t win ’em all —is used to say that it is not possible
to succeed at every thing one does: You can’t win ’em all. If
someone doesn’t respond to you or indicates lack of interest,
just move on.
Note: 
The expression does not correlate in meaning with the
phrase you can’t fight city hall— used to say that one is unable
to overcome officialdom or bureaucracy: When it comes to judi-
cial review of local government abuses, the fox is too often
left guarding the henhouse. That all adds up to the depressing
adage “you can’t fight city hall.”
you don’t say so • you may well say so
you don’t say so —is used to express surprise or sarcasm at
what smb. has just said: I explained my presence, and he said:
“You don’t say so! Why, I’ve got a patient over at Swampscott,
who says he knows you.
you may well say so —what you say is perfectly correct,
justified, etc.: “A craft that’s good for sore eyes.” “You may
yellow black
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well say so,” replied the commodore. “There is no finer
schooner-yacht afloat.”
you should talk • you shouldn’t talk
you should talk —(also: you can talk) you are in no position
to criticize because you are at least as guilty as the person you
are criticizing (used as an ironic or sarcastic response to a person
who has just spoken): “You are cold-hearted.” “You should talk
of all people!”
you shouldn’t talk —(also: you can’t talk) = you should talk:
“Andy’s always late. He won’t be here in time for dinner.” “You
shouldn’t talk. You haven’t been on time for dinner for years.”