In addition to his comments, what does the boy's patrol have to do with his MB? MBs are an individual pursuit. It's one thing if the Scout wants to ask his patrol to help him by foregoing the gear, it's another for you to dictate it.
The broader issue here is that MBs should not be interwoven into the troop program. You can, and I think should, keep MB opportunities in mind, but troop meetings and campouts are not merit badge school. Your dual roles, SM and MB Counselor, will recreate this sticky situation over and over again. Now that you've seen the potential mess early, leave it here. You be the SM, there are plenty of MB counselors.