Maria Menounos -- Boston Should Be Ashamed ... For Turning On Tom Brady

Maria Menounos is calling out the whole city of Boston ... telling TMZ Sports she was "embarrassed" by the way her city turned on Tom Brady during his early-season slump.

Menounos was in NY when we asked the Patriots superfan how she felt about Tom now that the veteran QB seems to be hitting his stride ... and that's when Maria called out Beantown.

Watch the video -- Maria isn't afraid to take her hometown to task on Tom's behalf and even manages to save a little love for his hoodie-clad head coach.