To understand the playoid you must understand the tiers >>96277528 is correct, but only for a single type. These tiers will be listed from worst to best

>Lemmings
They are "just here to hang", defined by their inability to remember the game system, events in the campaign or even their own character. You can safely ignore these players, don't waste your cognitive load on preparing for them. Their enjoyment is directly derived from how much fun the people around them are having, focus on the others. If you are saddled with a full group like this then you have fucked up.

>Wallflowers
While they do care about the more than just the social aspect, some part of their brain prevents them from engaging in any meaningful way. This is the upper end of stoner players, get them clean if you want them to advance out of being a shit-tier player. These players are defined by just being constantly silent, they won't do anything unless directly prompted. They will remember pieces of the system that are most relevant to them, and they may even remember game events. To prep for them just plan one encounter a session where you can directly look at them and say "_____ what do you do?". Usually this short circuits them, but they'll feel included and that happy fun time will keep the Lemmings happy and gain respect of higher tier players.

>Tards
You likely know one, the person who tries to "break" the game by being a nuisance either mechanically and rp wise. They can be fun to play with but become grating. The only thing keeping them above Lemmings and Wallflowers is they are easy to convert into better players. You can only "pretend" to care about something so long before you get actually invested. Don't prep for them, they take joy in ignoring prep.