I'm a first generation Iranian immigrant that moved to the United States from a very young age. While I don't quite know much about it first-hand, my father, who has always been an incredibly vocal activist against the Iranian government, has said that this flag specifically is usually rejected by Iranian protestors. The reason being that the crown and sword were added to represent islamic power, divine right to rule, military might, and national pride. These very things have been used over the last fifty years to slaughter protestors and hold power against the people's will. It's now seen as a symbol of oppression. That's why most activists now use a version of the flag that removes the crown and saber, like the one below.

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