i play videogames since the middle of the nineties.

is it important or should anyone care about it

NOPE!

do you like it if someone at the cinema a seat behind you tells the last 5 minutes of the movie while the trailers are running at the beginning?

well i can see that you just want to help and its a nice part of your attitude. keep it
but i can understand the other one too. he/she overreacts no question.