Yeah they are not even the worst pests that may appear in everyone's house.
IMO, the worst is definitely mosquitos. Their bite marks make you so itchy that you cannot focus on anything. They are very small and agile, making them very hard to hit. There are tons of them in plantations, which literally makes touching grass unenjoyable. Although there are many approaches to kill them or drive them away, most of them are not very effective imo.
I don't care what enviromental disaster it may cause. If I had a chance, I would wish all mosquitos be vanished from this planet.