Remain polite! No personal attacks
Most people should be able to take care of themselves in their dealings with others. Now and then there is certainly the need to reprimand someone, but it should not be taken to extremes. Aggressive behaviour and targeted personal attacks don't help anyone. The same applies to film screenings: The makers have a right to constructive criticism; if you can't provide it, better leave it alone. Of course, racism and sexism have no place in our forum! Please refrain from insults, slurs, provocations or threats towards others.