What incompatible qualities?

Trippet
Eh! Yes, sir. Those qualities are certainly found in an old dotard.
You are painting a wretched portrait of a handsome young man.

Peacock
But, I don't propose to marry my daughter to some old fuddy-duddy.
It's Mr. Flem.

Harriet (surprised)
Mr. Flem!

Trippet (same tone)
Mr. Flem!

Peacock
Yes, Mr. Flem. He's only fifty. Not old enough to be too virtuous.

Trippet
A virtuous man is not for Miss Harriet, and I am going to prove it. In
order to know the worth of a virtuous husband, is it not necessary for
the wife to be dispirited herself? First, give her a young man of
twenty, and not only will she be fine, she'll have a reasonable
husband.

Peacock
Nice reasoning. A smart daughter ought not to examine her future
husband too closely. She ought to consider it a pleasure to find one
agreeable to her father. Understand, Harriet? Now, on my return, I
expect to find you disposed to receive the hand of Mr. Flem. (exit)

Harriet
Did you hear, Trippet? Is there a misfortune equal to mine? Isn't it
enough to lose hope of being with Worthy? Now, I must reconcile myself
to becoming the wife of this detestable Mr. Flem.

Trippet
Flem is difficult to swallow--assuredly.

Harriet
Worthy, dear Worthy, what will your despair be when you hear this
news?

Trippet
Alas! I believe I can already see how unhappy he will be. What a
lively sadness moistens his eye. What tears mix with yours. Oh, I
loathe the old apothecary.

Harriet
Trippet, your joking is unseasonable.

Trippet
I'm not joking. I don't know any more than you what the future will
hold. But my point of view is different. You see despair and I see
cause for hope. I read the future in a way that is more agreeable than
you do.

Harriet
You are deceiving yourself. I am already unhappy enough to be married
to Mr. Flem. Without doubt, I will gag of it. But I will fulfill my
destiny. The more I have to suffer, the more my character will grow.

Trippet
I know very well that character thrives on hardship--but sometimes
hardship corrupts a pure heart.

Harriet
I hear a noise. Someone is coming.

Trippet
Eh, Miss, it's Mr. Worthy.

Jeremy (entering with Worthy)
It's he, himself, Trippet, and your loveable Jeremy.

Trippet
You come just in time, gentlemen. Help us avoid the storm that
threatens us. Dr. Peacock has promised his daughter to Mr. Flem.

Jeremy
To that flat-nosed pharmacist with thick glasses who w