- They're playing solo and you come across them randomly.
- They're part of your Random Dungeon group.
- They're part of your PuG Raid Group.
- They're a member of your guild.
- They're a member of guild's steady raid team.
- They're a long-time "in-game" friend.
- They're a "real-life" friend.
- They're a family member.
- Never. Only offer advice if someone asks for it.
I think most of us are more willing to offer advice as you go down the list. The more tenuous the social connection, the less likely we are willing to offer unsolicited advice.
Where I disagree with a lot of readers, it seems, is that I think it is perfectly appropriate to offer advice to pretty much everyone. Why not? Are you afraid of looking elitist?
Obviously you should be tactful, but if you're a skilled player, I don't think it's a good thing to just keep your head down and collect badges.