Is it possible that people can define who other people are just by their persona?

I find it weird how we can question other people then do the exact same thing to contradict why we questioned them in the first place, we all experience different things at different times and this made me think, “maybe we just see things through different eyes”, but every time I've saw someone question something some other person has done, then they come to the same experience, they act the nearly exactly the same, or in a way that makes you think, “You hypocrite”.

Just makes me think do people have principles or any self-respect to keep to what they say or do they just do what they do at the time and how they feel?

Open for debate if this makes sense to you.