US is by and large our biggest client. Pakistan enjoys GSP privilege, we don't.It's not about democracy. Singapore (highest GDP per capita in Asia) is a soft authoritarian meritocracy with democracy only in name and China (highest GDP in Asia and soon the largest economy in the world) is a proper political meritocracy with no political equality.
It's all about policies and good leaders.
Also, BD's exports have been at the back of Least Developed Nation and other statuses that Pakistan doesn't enjoy. If you take some key things away, the 'democracy' would start looking pretty bad there too.
As @Black_cats mentioned, India and Pakistan chose to opt out of LDC status. Your active choice.
I hate these comparisions with India and Pakistan but things need to be put into perspective.