The thing you need to understand about Riverdale is that people there don't react to things with the normal levels of emotions.
I mean, that's pretty obvious, right? The entire town --- the entire universe in which that town resides --- is built around the idea that this one teenager is so irresistibly alluring that it has resulted in a 75-year love triangle with dozens of characters caught in its orbit, and even if you're going by the upcoming TV show's version of Archie and his abs, that kind of all-consuming conflict is a little difficult to believe. In Riverdale, overreacting is just, you know, reacting. Which is how you get stories like the one where Veronica Lodge gets hit by a snowball and then very seriously threatens to murder an entire town.