Re: sunni's praying in a shia mosque..
Alhamdulillah, nobody has passed any bad comments about this topic.
I hope Muslims unit into one Ummah soon and forget these differences.
I had a Shia friend in Lahore. He used to pray with us (in his own manner) in our Jamaat of 4-5 friends (in our gatherings at home) and whosoever among us lead the prayer specially kept in mind to be slow in leading the prayer so as to enable hhim to tune in with us. Alhamdulillah, it worked and he eagerly prayed with us.
Similarly, we did the Iftaar with him. Although he broke his fast a little later than us but we always accomodated him and we happily offered the prayer later on.....