Cat nip affects different cats differently.
The thing to remember is: YMMV
Some cats are totally unaffected by nip.
Some are mean drunks. We had a big tom who was very friendly. Given the nip, however, and he wanted to fight everyone in the bar!
Some are maudlin drunks. One female was very standoffish with everyone. A little nip and she would be rubbing up against everyone whilst turning her belly up for rubs.