Why are Rin's friends still mad over the fact that he is the son of Satan in season 2?


In season 2 episode 1, Rin's friends are still mad over the fact that he is
the son of Satan.

Isn't this already over/resolved in season 1?




Yes, it is resolved in Season 1 but Season 2 is not a direct continuation of
Season 1.

To go into further detail: Season 1 of _Blue Exorcist_ becomes anime original
starting from episode 17. There was a lot of backlash from the fans and if
they wanted to make a Season 2 it would be impossible to continue from Season
1's end. So, the studio completely ignored all the parts from Season 1 that
deviated from the manga in Season 2.

