Facial hair and clothes. Tony doesn't drink.
Plus I strongly suspect you are actually describing Robert Downey jr.
I think your argument is very weak, especially considering how little exposure Riri has had so far.
I am not saying she is a strong character, because she isn't a character at all.
But she could easily be one.
Thing is, what set Tony apart back when he was created was that he wasn't counterculture, he was establishment.
We were supposed to hate him, but were then made to love him, going by Stan Lee's plan.
Maybe Bendis is going that way, too - giving us a heroine we are bound to hate, but then making us love her.