Being nice to people is not a case by case basis. When you act nice, you do it to everyone, to everything. You never go behind people's backs, you never talk bad to their fronts. You have fun, and you just... be nice. I don't know how else to explain it. Have a good day, folks :)
@Thoculus, there's a difference between trying to be nice whenever possible, and being completely nice all of the time. We should all strive to be nice whenever we can, whether being nice all of the time is possible or not. :)
