Mosquitoes.
Useless little shits deserve to all die. They exist for no purpose and kill a large amount of humans every year, while also being massively annoying.
After we've fixed the mosquito problem, we shall next move on to developing a biological weapon (Virus? Bacteria?) to kill all the fleas and ticks.
Make it happen and the entire world would throw their money at you in thanks.
Not sure why so many people hate wasps and spiders.
Leave both alone and they'll be total bros, fucking up the other little insect bastards you hate and generally being cool.
Wasps not so much, but the best example of this is when you're an Australian like i am.
The Huntsman spider is a massive, scary looking thing and every time i find that one has decided it would like to set up shop and live in my room or kitchen, i am so incredibly happy. They hunt down and brutally murder EVERY other insect that i hate, and you can pick them up and relocate them with your bare hands. Huntsmans are absolute bros and i actively go out of my way to ensure i don't harm them, to the point where if a fly is buzzing around my room while a hunstman is around, i won't use sprays to kill it.
Now, redbacks, funnelwebs and white-tails on the other hand?
Fuck them. Fuck them all with a rake and then burn their corpses.
Actually, you guys that hate spiders and wasps... What do you do when you come across spiderwasps?