Just because someone claims to be a prophet does not mean it is the truth. It is your belief but may not be shared by others. Jesus is claimed to be Son of God - do you share that belief ?
If Khamenei claimed to be a prophet, would it satisfy you ? I think some call him deputy of "Imam Mahdi". Some even said Khomeini was the 12th Imam, and he never denied it. Again it is the belief of those who believe, you may not share that belief.
That is why I use the term religious figure for all who claim a special place, above the law, above other humans, representatives of "God".
And, I don't hate Islam but I am not with those who use Islam to force their opinions and dogma on others. Everyone is free to believe what they like, but don't impose your opinion on others. That's all.