What causes Mrs. Popova to call Smirnov "a bear, a brute, a monster" in Anton Chekov's "The Bear?"

In Anton Chekov's play, "The Bear," Popova calls Smirnov a
"bear" because he has accused her of being insincere—he has a poor opinion of women in
general, but he regards her as a beautiful woman who plays games to get attention. He
accuses her of dressing in mourning in order to impress those who pass by her
window.

Popova is furious because Smirnov lumps her into
the category of being insincere as many women are.  Smirnov says to
her:

You have
the misfortune to be a woman, you know from yourself what is the nature of
woman.

She hates him because
he makes fun of the very noble mourning she is observing, even while her dead husband
does not deserve it.

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[When...] some tame poet goes past your windows
he'll think: "There lives the mysterious Tamara who, for the love of her husband, buried
herself between four
walls.

And she is frustrated
because her husband was a brute, and here is the angry Smirnov (because he is unable to
pay his debts) trying to tell her she a fake, while
he acts like her husband—rude and offensive, just as her spouse
was.

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POPOVA. 
You don't
know how to behave before
women!

SMIRNOV. 
No, I do know
how to behave before
women!

POPOVA.
 No, you don't!
You're a rude, ill-bred man! Decent people don't talk to a woman like
that!

Later Popova tells
Smirnov another way in which her husband wounded her:

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...he...made fun of my
feelings....

Finally, Popova
cannot stand it any longer and she lashes out at Smirnov with the same fire and fury he
has been unleashing on her. Ironically, whereas it might seem this would only further
enrage him, Smirnov finds her entrancing, passionate and irresistible. By the end of the
fight, the two have fallen in love.