It is proper Netiquette to watch video responsibly. Don't watch content without any redeeming qualities.
Do not watch harmful content or let others use your content in harmful ways. Viewers are responsible for what they watch. Watching harmful content without moderation is irresponsible.
Consume content with redeeming qualities. Moderate violence. Don't make harmful content available to children.
Watch responsibly because graphic content may have redeeming qualities and children have to be protected.