The ideal situation would be that this honor (and yes, it is an honor and you have a right to be proud of it) gets one line at the end of the list of honors on your application to both make them aware of it, and to show that you aren’t taking yourself too seriously. And then your guidance counselor in his/her recommendation talks it up as evidence of your outstanding social skills, ability to persuade and influence peers, and to have an impact on the school culture (which is what that honor demonstrates). If you have a good relationship with your GC, you can talk about the fact that you don’t want to look arrogant by making a bit deal of it yourself, but were wondering if the GC could bring it up.
Those who put you down for being ‘most popular’ (and implying that you are superficial and have nothing else in terms of leadership or impact to offer) are just being snarky. It’s immature to talk down someone else’s accomplishment.