DB07 beat me to it.
Let's have another buy-cott and completely overwhelm the kiss-in folks.
Another consideration, though: These people are looking for a confrontation. Yesterday, at the buycott, everybody was happy and friendly, even though the lines were a mile long. Tomorrow is going to be confrontational.
So, I say that we non-kissers be very nice, and even buy the kissers a sandwich. In addition to overwhelming them with numbers, we can overwhelm them - and win the debate - with kindness.
Another idea is to have us heterosexuals do some kissing too!