Reza Khan was a rowdy lout
If you see that all respectful Iranian people are opposed to Reza Khan, it is because Reza Khan was a rowdy lout absolutely ignorant and unperceptive of religion. He grew up in an uneducated, rowdy family, unfamiliar with religious teachings, and when he grew up, he roamed about in cafes and bars with louts. Reza Khan was not familiar with religion at all. He was potentially ready to counter the religion—with the purpose of obliterating it. There are some mistrustful and distasteful individuals who sometimes praise, for instance the construction works done during the reign of Reza Khan, saying he developed railways and established security! They should ask whether the construction of the railway and the establishment of security were for the good of the people or foreign powers?! Who benefited from these so-called construction projects? In fact, Reza Khan was an agent that the British appointed to put an end to the religious system in Iran.
For the same reason, in 1935 Reza Khan prohibited wearing a turban and banned the presence of clerics in the society, disrupted the seminary system and forced the clergy to remain at their homes.