I’ve started a band

The past couple of months I’ve started up a band I’m from Australia it’s easy to find musos my age and I get along well with most people. I would say I’m a very social person a lot of friends and can easily talk to people but with starting this band there have been issues with this one guy. For the sake of privacy I’ll call him K. K and I first got into contact around March-April and he seemed like a nice guy and got along well with similar music tastes stuff from the 60’s to today but I have a few issues with him. For starters he is very 90’s obsessed and wants us to be a grunge/punk but now personally I don’t like grunge/punk it’s not my style I don’t mind some of it but most of it annoys me, and myself being a guitarist I like the complex stuff such as Led Zeppelin, Deep Purple, Pink Floyd, Eric Clapton, Jeff Beck etc etc. I don’t mind 90’s bands there are some good ones but the way some of them sing with that thick American accent pronouncing their R’s real hard it annoys me a lot. With K he has taken on this pronunciation within real speech him being from Australia you wouldn’t be able to tell he was from here because he pronounces his R’s hard. But getting back to the point he is really 90’s obsessed and always sends me videos on Snapchat writing stuff while this is all well and good it’s annoying because we’re just starting out and trying to get a footing as to what we all like the other guys in the band like the same style of music as I do and and I feel like sometimes K takes over a lot. He appointed me as “leader” of the band when we started and said that he didn’t want to be “leader” and in his last band it didn’t work out well. I invited a 5th guy into the band and K was having a fit about it saying “we don’t need a second guitarist it’s unnecessary” but some of the songs he wants to do needs a second guitarist while he plays acoustic his skills aren’t that good compared to me or the other guys he can strum chords and stuff. K also wants to organise gigs now when we’ve only had one practice session with just 3 of us as the other 2 guys didn’t join until a couple weeks ago. I suggested some songs to do such as classic rock and blues numbers everyone likes but seeing he is the singer her either says no or I can’t sing that which leads me to the mindset that I want to kick him out of the band and find a better singer while he can sing he can really hit notes as well as he thinks he can. What I also find annoying and weird is that he called me his “best friend” after only knowing him for a couple of weeks he also talks to me about sex and what I like to do with sex with Australia culture we joke about having a root or stuff like what we like be he does it to a point where it’s weird. I have a feeling he is ok the spectrum and if I were to kick him out of the band he would have a massive fit and most likely harm me or the other guys. He always says let’s do this as a team but doesn’t actually mean it he said to me a couple of days ago “you and I will be the group leaders” and my initial thoughts were “didn’t you appoint me as leader” I don’t want to do him dirty but it’s getting to a point where I can’t stand talking to him and the constant video snaps he sends me at 1:00 - 4:00 in the morning are ridiculous our second guitarist had a trade and has to get up early for work and woke him up last night when he was spamming the group chat and I said bro it’s time for sleep cmon be fair and his response was “put your phone on silent” and “ Nah its when i write. At night” he’s just a complete dick now and I don’t know what to do whether to keep him for a bit and then kick him out or just kick him out now