I (21) have been living with my best friend (19) for about 8 months now. It's been decent for the most part, always pays his rent, doesn't complain about noise, doesn't have random people over at all, and we're pretty good friends. My main gripe is he REFUSES to do the dishes. I am not exaggerating when I say he has done the dishes less than 6 times in the 8 months he's lived here. It genuinely pisses me off. He'll make food or use dishes just like I do but he acts like because I'm the only one that really cooks meals (which I always share with him or offer to), I'm the only one that has an obligation to clean our kitchen. 

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And it's not just a "oh he has a threshold, he'll do them eventually" type thing. I've asked him as much a 10 times in one day to do them and he says "in a minute" and just keeps smoking weed and playing video games. I'll go out of town for a weekend and purposefully leave them undone and ask him to do them so I can cook when I get back, not only will he not do them, he will use more dishes and leave them on top of the old ones. Anytime I "test" his tolerance to filth I always lose, because he will let fruit flies, slime molds, and even fucking MICE propagate in the kitchen like it's no big deal. On the VERY few times I've seen him actually do them, he will just throw dishes away in the trash if he thinks they're too dirty, and leave the excess food waste to rot in the bottom of the sink. I've vomited before just cleaning out the rot. 

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Last time I'm making food he comments saying he might want some, I said "only if you do the dishes". He replies to me I shit you not with "You don't do them that much more than me, and besides I'm the only one that ever finishes them" which is utter bullshit (only reason he's ever "finished" them is because I do the bulk of them and leave like 3 bowls in the sink to soak). I'm to the point now where I am sick of this shit. I am tired of feeling like I live with a 9 year old and it's genuinely starting to effect the way I view him as a friend. I am considering him telling him that he's not allowed to use the kitchen anymore because he's not responsible enough to do so, perhaps even putting a lock on the kitchen door to make my point. Would I be an asshole for this?