When MC got rejected in the hall by Celia, I remember thinking that when everyone around was saying "OMG did he just ask her out?", he might've been able to lesson the blowback if he'd just smirked and shrugged it off. "Hey, worth a shot, right?". Him looking so traumatized, devastated, and serious about it probably led to the amount of teasing that he got.
All that being said, I have zero social skills irl, so I may just be completely off on that XD
Disclaimer: Yes, I do understand that these are fictional characters and that the events never actually took place =P