That's kinda funny but yeah I'm sure it's really annoying.
Since you have a 2nd rb, I would've thought you knew that when you cast LT and do some action, all the people getting LT from you do that action too. So this guy finds you and makes LT, has you do some dumb action in TG, then leaves.
I don't know if this would work, but perhaps you can block his influence by having your own 2nd rb cast LT for your account in TG. If you need the 2nd rb for something else (to screw with the other guy

) you can try stacking a noob on the tg account before cancelling your LT so that your account keeps getting LT after you leave.