Do not accept hair advice from this Eighties throwback.
"Throwback" could mean a couple of different things, here. It could be a reference to time, and not particularly insulting, meaning that the person called a "throwback" is living in the past.
To a fisherman, when he calls a person a throwback it means that the person is not worth taking seriously, too small (as in small minded) to be of any benefit, a total waste of good bait, and the only thing to do is ignore them.
How do you mean it, over there and in this case?