That isn't true, a mu'min is a status that can be achieved by any human. The Imams do have a special status in Shia Islam, but anyone can be a mu'min.
By anyone do you mean anyone who becomes a 12er ? As far as I know a 12er believes only if you believe in 12 Imams you can be a momin, otherwise if you are not a 12er you can't be one. On the contrary, in your sect non-12ers are just plain Muslims. This is why we are referred to as Ammi.
Secondly, what Ameen is saying is generally true. It is generally the Sunni world that practices takfirism and kills shias. In Iran are there massacres happening there against Sunnis? No.
That's why no Sunni mosques are allowed in Tehran? Also, there has been assassinations attempts against even 12ers in Iraq who disagreed with Waliyah al Faqih. Recently Norman Finkelstein went to Iran and confirmed that nobody is allowed to speak against Khamenei.
Shias are killed in bahrain and saudi for just protesting, they were massacred in Iraq by Saddam just a few years ago, they are being targeted in Pakistan by taliban and are currently being killed by ISIS/AlQaida/etc.
Al Qaeda, Taliban and ISIS even kill Sunnis who disagree with them. Even Saddam massacred many Sunnis and especially Kurds who are Sunni.
As for 12er Shia killing there are Iraqi Shia militia who got frustrated with what Saddam did in the past and they in revenge massacred many innocent Sunnis, and continue to do so till this day.
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I misread what you said I thought you said only the 12 imams were mumin. Only Allah judges and knows who are truly mu'min.
There aren't sunni mosques in Tehran because the government says that there is no such thing as a shia or sunni mosque and that all mosques are meant for all muslims.
People speak against Khamenei all the time, even during the green revolution he said that if people speak out against him its okay and that people should treat them with patience, it was during his qhutba.
The point is, sunnis aren't being massacred in Iran, but shias are definitely massacred in Saudi, Iraq, Pakistan, Bahrain, etc.
I am not going to deny that shias may have killed Sunnis, but when that was only after many years of oppression and even then Ayatollah Sistani who is the leader of all Shias and respected by Sunnis as well made statements to not react violently against the Sunni community. His famous quote was that "And do not call Sunnis our brothers, but call them ourselves."