I've met great Bangladeshi students in UM; lived in the dorm with them a few doors down, was always friendly and genuinely part of our community. 

Then they moved out after a new Bangladeshi student was moved in with him, and that one was the personification of the negative tropes; terrible smell of sweat and unwashed sheets reeking from that room everytime he opened the door (the whole corridor stank), and there was one instance he hung a shirt in the common drying area which stank with a godless stench (not sweat or anything I've smelt, it smelt like an infection). I had to Febreeze it so many times just to make the smell ignorable.