Florida Man's General Store in Cultivation World by DamnPlotArmor

Everything points out that Earth was too advanced before the shit happened, like having spaceships and so on, and even he himself points it out using a phone and explaining its features which are unrealistic in our time, and need around 1000 years more to make it happen, yet his memes and talking way show he was around on earth in the 2020s, which is impossible for obvious reasons, the author forgot that memes die fast, so he should've just used our timeline and moved on with it.

he gets years added to his life by eating herbs and shit, there was for example a mushroom that gives him 1 year for every gram he eats, so he ate a lot and got a couple of 1000s years when he needed them. yet later he ate a whole one and got just 1 year. (system nerfing when the MC doesn't need it that much)

it is his personality in general, which you will find fun at the start, but then it just gets cringe! and when you realize he is 50,000 old guy who lived almost all of it alone and fighting for his life, it just makes it sound more stupid when you see him acting like a 10yo Fortnite player, talking all memes, and using actors, sites, shows and people names-(that should be 1000+ years old when he was born)- and trying to sound "cool"

and as I mentioned before, the system nerfing which is one of the most annoying things in a system novel, but meh.