Iran's anti-Bangladeshi sentiment

My wife and I applied for tourist visas to Iran. Today we had our applications denied - in just 5 days. Apparently, this is normal for some countries. This shows a clear anti-Bangladeshi policy on behalf of Iran. They don't want tourists to go from Bangladesh to Iran. Perhaps they consider us 'meskin' (poor)?

We are a Muslim country - so Iran should welcome exchanges between brothers and sisters. Or is all that talk of Muslim brotherhood just talk? How can Muslim countries know each others' cultures if we are not allowed to travel freely to Muslim countries?

I hope the current ambassador will persuade the Ministry of Foreign Affairs that they should promote understanding between Muslim countries - including Bangladesh.