Thoughtless move or not. You are the keep clear boat. If that means forcing you to gybe then that's what it means. Once you gybe then you are inside boat and get room at the other mark. I don't like the way the rules work here either because boats can force you to gybe and then gybe for the favored mark. Just part of the game now that I understand it. Don't count on your competitors to understand it though.

Notice that rule 18.4 does not apply at a gate.

18.4 Gybing
When an inside overlapped right-of-way boat must gybe at a mark to sail her proper course, until she gybes she shall sail no farther from the mark than needed to sail that course. Rule 18.4 does not apply at a gate mark.