How did the guards own prejudices impact residents of the camps?

They actually impacted the residents of the camps but were not necessarily aware what was going on they were more brainwashed than anything else.

Answer: Because they have to create the perfect race, anyone who was considered a threat to this plan should be exterminated. In their minds, some groups were specific threats.

Explanation:

Hitler, and all your guards, thought that people of some specific kind, like Christians or Jews, for example, were not of a perfect race, so he would send them to concentration camps to maliciously kill them.

In addition to being racist, they were sexist too or just didn't like a certain group of people, that's the reason why they would target different types of people, like women, twins, homosexual, etc.