It's not okay to not give someone personal space.
Kevin is at a library to study and there is one other student seated at a table.
Kevin wants to find a place to sit.
Kevin finds an open seat at a table that is unoccupied.
Kevin sits very close to the other person at the library.
The other person at the library will be able to study in peace.
The other person at the library will think that Kevin is invasive and move away from Kevin.