Nonsense. Who told you such rubbish? Go fire your professor dear child!
The U.S. economy is 85% internal (i.e. no impact due to falling Dollar), 9.5% imports (i.e. gets slammed by falling Dollar), and 5.5% exports (i.e. gets a big boost from a falling Dollar).
Now look at our trade imbalance. We import more than we export...and we want to bring that closer in to almost balance with our exports.
The single factor that reduces imports and expands our exports is a falling Dollar.
On the other hand, if you want more Chinese goods on your retail store shelves, then keep hoping for a strong Dollar propped up by a Chinese Yuan to Dollar peg and massive foreign government buying of U.S. Treasuries.
After all, a "strong Dollar" benefits the Chinese and Europeans.