Keep the discussion focused on Saudi Arabia and Iran ..
Individuals may have good or bad experiences, the point of discussion is treatment of Sunnis by the authorities in Iran, can the name their sons and daughters Abobakr, Omar , Othman, Ayesha , Umme kulthum etc who are highly respected by Suniis?We don't even tease our Sunni brothers about their religion in Iran. When I was in primary school, I had a friend whose family had come to Tehran from Sanandaj, a Sunni majority city in Kurdistan of Iran. We treated him exactly the same way as others and we never made jokes about him or his religion.
There are several Sunni mosques in Iran built by the funds of the Iranian government Mosa.