Can someone explain to me the culture of different 'shops?'

Hi, I’ve been reading the forums for a month now, but I’m sure i’m missing more of the relevent conversations because I don’t really understand why certain people are denigrated for working at a “discount shop,” or “boutique” shops. I’ve never worked in the industry, and since I"m still not in it yet I’d like to know what the differnt ‘reputations’ are with respect to the various ‘shops.’ I knwo I proabbly can’t get this info in a book, so I’d be happy if someone could give me their take on this. Also, other then the “big” shops, what other examples of “acceptable” shops an entry level lad could join and have it as a non-hinderrance in his resume? Thanks everyone.

anything that has institutional clientele.