Anyone that's in-game is an approachable party with an exception to on duty staff members or players in an administrative situation.
If you plan to go AFK, especially in a public environment, don't be surprised if people might start a role play with you upon your return.
As long as a player is not being RPed upon while afk (RP is forced upon him.), but the role play starts after his return (He can be surrounded already.) then there's no issue in this case.