I only give advice if someone asks or if I ask them (if they're a fellow bard/class I'm familiar with) if they need some pointers. These people are more willing to listen if you wait until they ask/ask them before shoving it at them. I've yet to have one person react badly when I use this method. I also encourage them when I see them applying it. Some people may see this as coddling, but honestly, you never know what this person's gone through in their day. They could've spent their entire day getting bitched at by their boss at work or yelled at by other players.