I would think that this means that every one is effected differently or impacted in a different way.Here is an example some people are scared of the dark and think that there is evil within the dark and some people are like ehhh the lights are just off ope this helped :)
I think that this means that not everyone has the same mentality, so therefore, situations can mean different things to different people. For example, every person experiences life differently whether that be different cultures, environments, or religion. This all affects how a person develops moral, ethics and their thinking process. Also, people learn new things every day which can also influence their, already existing, mentality meaning "[their] response can change over time".