i think it's right to say something when it's a clear matter of right and wrong such as smoking, celebrating a holiday.. haha.. stuff like that, but if it's a conscience matter you really have no right to make someone feel as if they're doing something wrong, just because you don't like it.
well a lot of people do things that definitely go against bible principles and then they excuse it as a conscience matter. It's not always self righteousness. Sometimes it's just righteousness.