Generally speaking, having one asshole dog around a bunch of well mannered dogs will make the formerly pleasant animals assholes, too. Dogs are latent learners, so if they're introduced to a dog that barks incessantly, or chews their kennel, or climbs or digs... they're likely to start to mimic the behavior. I have one dog that likes to carry her water bucket around. She'll drink her fill, then tip the bucket over and just trot around with it. It was never a problem with any of my other dogs, UNTIL I had to put her in a kennel in between two others. Now, all three of them do it, almost in unison. Being a pain in the ass is definitely contagious in the dog world.

Barking is a little more complicated, some dogs will never bark to compete with a frequent barker, some will. A lot of it will have to do with how you handle the barker, as you said. I have a number of Bolio and Bolio-cross dogs who think they were put here on this earth to bark all day long. Amazon sells bark collars for about half price, and every one of them is sporting one. It works because [1] they're getting corrected IMMEDIATELY for the barking, so they don't get confused about what the issue is and [2] dogs who are looking on aren't seeing me go out to the barkers all day long to yell at them which, depending on the dog, could be something they still think of as extra attention.