It could perhaps have something to do with the fact that beedrill eat cutiefly.
Contrary to popular belief, beedrill are not herbivores that feed off nectar or pollen. Rather, they’re carnivores that attack prey with the three stingers on its body, then drag the corpse off to their hives to feed themselves and their weedle hatchlings. While beedrill will generally attack and eat anything that’s both smaller than them and considered meat, they gravitate especially towards other bug-types pokémon. Cutiefly, being part-fairy, are a bit of a delicacy in particular.
In short, I would consider keeping your beedrill as far away from your friend’s cutiefly as possible.