Not So Harmless Fun
While the OP might consider this a harmless jest, individuals like them are why we can't have nice things. Some individuals exploit situations like this, ruining them for everyone. If every married couple consistently engaged in such antics, restaurants couldn't afford to provide free meals to genuinely engaged couples.
The OP had their proposal moment – now it's time to pay for their meal like everyone else and allow a new couple to bask in the romantic spotlight.
