What is it about alcohol that makes people aggressive?

Is it something in the alcohol? Some people say different types of alcohol make them aggressive..which would suggest so…

Is it rather..more to do with the chemical changes in the brain? In which case..why does it affect some and not others? although I know we’re all different neurologically..sooooo…

given that sometimes aggression can be rational and sometimes irrational?

um…or something else?