Greifing is defined Minecraft wise, as: "Adding or subtracting anything undesirable to another person or their property which ruins the function of a game." Some OPs go to the extent of saying words are also a part "griefing" such as persistently harassing an individual to ruin the function of Minecraft (E.G. ruining fun conversations by privately spamming someone so they can't read the chat)
Of course, I call things what they are, spam, trolling, harassment, etc. I leave "griefing" to strictly property or gaming functions only. For example, I consider someone who hacks Minecraft which allows them to teleport to another player constantly when the player wants them to leave, griefing. I also consider griefing to be placing large undesirable builds next to another person's build when the player first there expressly stated they didn't want it there. I DON'T consider someone spamming another person in chat privately, to be griefing. I leave the respect rule to do it's job in those areas. =)
Of course, I call things what they are, spam, trolling, harassment, etc. I leave "griefing" to strictly property or gaming functions only. For example, I consider someone who hacks Minecraft which allows them to teleport to another player constantly when the player wants them to leave, griefing. I also consider griefing to be placing large undesirable builds next to another person's build when the player first there expressly stated they didn't want it there. I DON'T consider someone spamming another person in chat privately, to be griefing. I leave the respect rule to do it's job in those areas. =)