I would be 'democratic'. Obviously it wouldnt if the goalposts changed after the event, but not if thats what was known beforehand.
Ultimately democracy simply means that the people hold the power, and they would with a 50/50 vote or a 60/40 one.
Supermajority votes arent undemocratic, they are widely used in Govermental/legislative/constituational scenarios.
https://en.wikipedia.org/wiki/Supermajority#Use_in_governments_around_the_world