India is big country, depends on the relation with bangladeshi migrants in the area.
Generally speaking, Indians who only know bangladesh as some distant land(no personal contact with bangladeshi), know about it when its about cyclone or some boat tragedy, think its some poor country.
Those who know about 71 war either have some affection or some anger(due to the idea that bangladeshis betrayed us after taking our help)
In areas of significant bengali immigrant population its usually positive(due to their hard working and non-confrontational nature). NE people seem to be threatened by them, but the anger is equally directed towards people of WB & bihar there.
Yes, unfortunately people have more posititve things to say about bangladeshis than biharis (something that is already mentioned by OP, and a fact
@bongbang still cannot fathom, which is why 'Indians hate Indian' generic statement
)