I will make some point against these observation.
1.Debate on military affairs is done by a very small segment of active facebook or youtube users usually with extreme views.They are no way correct representative of the whole population.You can correctly gauze the public perception only by taking random poll on the street or from a mass spectacle cheering for something where people from all walk of life meet.For example, a cricket match where 40k-50k people gather from all segment of the society.These 40k-50k people correctly represent the country, it is like a massive public opinion poll.And if you follow Indo-Pak cricket match in Bangladesh, you will notice ,at least 75-80 percent people are cheering for Pakistan.This phenomenon is enough to convince anyone about the true mood of the people of a country.
2.It is true that, many Bangladeshi people give the example of 1971 war.But it doesn't mean all of them have negative attitude towards current Pakistan.It is much like how many American boast about the American victory in ww2 over Germany and Japan.It doesn't mean they hate current German or Japanese population.Same is true with Bangladeshi people.
3.Whatever you find some Bangladeshi people are criticising Pakistan on social media, you will find 10 times more of that criticising India.Because India is our current adversary.
4.Bangladesh's relation with India was rather frosty all the time except Awami League rule.It is only during Awami League rule when relation with India become warm.All other times, Bangladesh is much closer to Pakistan than India.Military tie with India was non-existent until very recently,there is not much cultural exchange except West Bengal due to similar language.This type of cultural tie also present among two Punjab.And for business, China is our bigger partner than India.