Deine Mutter darf der Mann trotz ihrer Art nicht beleidigen!

I don't get this sentence from 14.8:
Deine Mutter darf der Mann trotz ihrer Art nicht beleidigen!
It is translated as:
Your mother shouldn't /may not be insulted by the man in spite of her ways!
Shouldn't der Man be dative?

I think that "deine Mutter" is the object and is therefore in the accusative, and "der Mann" is the subject and is therefore in the nominative.  

Hi there,

James is partly correct. These both cases depend on the meaning. It's either:
"Your mother shouldn't be insulted by the man." which uses the nominative case for "der Mann."
" Deine Mutter darf der Mann nicht beleidigen."
or 
"Your mother shouldn't insult the man." which uses the accusative case for "den Mann."
" Deine Mutter darf den Mann nicht beleidigen."

Besten Gruss!

Paul

I think I understand so taking it literally
The man is not allowed to insult the mother...

I always thought it was odd that the feminine accusative case is the same as the nominative.