Ignore those guys.
The same thing happened to me on Tattoine. I agree it's an exploit that needs to be fixed. Players of the opposing faction should not be able to trick anyone on a PvE server into flagging for PvP involuntarily.
Agreed. The only
way to flag yourself for PVP on a PVE server should be by manually selecting a menu option or typing in some kind of /enblepvp or something.
You should also not flag for PVP if you buff someone from your same faction who is flagged.