These are sore points, so, to my mind , it would be better to avoid them completely, even with your teachers. However, if the discussion goes well, it can be continued. Unfortunately, no one can guarantee that it won't go wrong later because not everyone can control themselves and remain respectful to each other. Anyway, the discussion should be stopped if someone goes too far. For the same reason I don't like questions on italki like "What do you think of my country?" Would that person feel happy if someone said something wrong about it?