Edit: I just saw the rest of the messages in your comment.

I wouldn't have given you back the account either in their shoes. You just claim things that anyone could claim from their point of view, they have procedures they need to follow.

They can't try your password, or see it anywhere and would never ask you for it either.

They're asking simple things that you should have been able to verify. After that they'd likely ask for IP addresses and last 4 digits of card used etc.

They have to do this, or anyone's account could be hacked by social engineering all too easy.

I honestly don't see how you can turn the blame on him. It's not his fault the support didn't ask for the right things. It's actually part of Rockstar support procedure to ask essentially public information like previous email addresses or previous nicknames. On my first try they asked the same things from me. On my second try they also asked for Steam purchase history and game keys. It's not his fault the support fucked up and didn't ask for the right things.