Super duper entertaining post♥️. But I'm in the minority of people not annoyed by modak mirchi. I thought it was cute. I have a different take to this. I actually have a lot of friends in school/college who have really strange nicknames - literally makes no sense sometimes or is actually embarrassing nicknames and to many people their names sound really weird and annoying but its an inside joke for us. Theres a lot of fondness, memories, nostalgia attached to it. And it does not get old at all. In some cases the origin of the name is from something that is like essentially redundant or even forgotten but the name has stuck because it was like our special name for the person that no one else uses.
I think this modak mirchi will be one of those special things for of Sairat ki no matter how annoyed anyone else gets by it including audience (lol), for them it'll be this special thing. A name they gave to each other for very sweet reasons. Each time they call each other MiMo they are commemorating their friendship and reminding other delusional creatures that they have a special nickname for each other which was thought out and is not just a short form of their actual name but is born out of some private memories. And it'll be something that only they can call each other. Just like jeeva-shiva it'll be exclusive. MiMo Maybe kinda childish lame and annoying to others but it will be still be exclusive!