(Kind-of) Theory Question: Confused about the boss/worker dichotomy

One thing I often see around is basic socialist definitions of working-class/Proletarian and Bourgeoise which AFAIK posits the Bourgeoise, "the bosses", as a group who take a cut of their worker's wealth while undergoing less labour and commanding authority of those workers. A lot of the time in socialist circles you hear "workers" and "bosses" being discussed as totally separate entities, and that bosses are completely irredeemable for having exploited the labour of workers.

However as I go into the workplace, I'm finding this doesn't line up with what I'm seeing. For one thing, there seems to layers of bosses, bosses have their own bosses and seem to have their labour exploited as well, and even face abuse. There is clear overlap between the sphere of bosses and workers that contradicts the common idea online that it would all be fine if we just guillotined all the bosses.

Also does that mean that if I were promoted to say, a sub-manager, that I would immediately become part of the bourgeois class? Have I massively misunderstood this system of socio-economic classification? Thanks, and sorry if this is a mess of uneducated garbage talk