How to define its borders?

It often happens in life that we do not notice how we invade other people's borders and how people invade our borders. For example we all know that coming in, guests need to behave in a cultural and not open for example without asking someone else's refrigerator , we will first listen can it be done and consent we are opening or Vice versa, but there are people who not only didn't ask about the refrigerator , and it will open silent tear that thing will eat everything I want and would feel somehow strange , Yes I agree all these boundaries are different from who they are wider someone already , but I'm sure that everybody does not like when you legal without your permission . I have often met such people absalyutno insensitive and in violation of my boundaries , now I'm learning to tell others about it immediately , not waiting for the last of the boiling point when in addition to swearing nothing can be said , but just warning you that I don't need and people accept this , this is much less fight and not dopodomani,