It's probably an exaggeration on how often this might happen, but it being a common trope in manga shows that this is an often enough occurrence to be satirized.
That's the nature of Battle manga, the current enemies are stronger than all enemies before them, and the next arc's enemies will be stronger than the ones in this arc, it's on the author to make the surrounding story interesting enough for people to suspend their disbelief
Yeah, this chapter is pretty stupid. It puts him in a bad light, making him way more dislikable. If the author doesn't use this development to make him apologize to the new girl, this will be a drop for me