Turians are hierarchical, Spartan, and disciplined. Garrus is all those things but he's mad that Citadel cops have to obey rules and he prefers being in the much shallower hierarchy of the Normandy following a Spectre around. Asari spend their youths exploring, learning and picking up influence, which Liara does. Being social and seductive is a stereotype other asari openly deride sometimes. Wrex loves a good fight, he's just tired of krogan-on-krogan violence specifically while Grunt is all about fighting anything with a pulse, much more like the stereotype. The quarians are a straight standin for the real Roma and stereotypes of them being lazy vagrants is pulled from real world racism. Tali isn't different from other quarians because every single one of them is a hard worker and keeps the fleet operating. In at least one of the games you learn about how quarians will dip out from the fleet to search for resources in small groups before returning. That's how you run into Tali, twice.