I said, "since these are the kind of people that agree with his beliefs." 
You said, "Trump did not win the election by only appealing to the fringe"

I agree with your statement, but pointing out that people with fringe beliefs (his crazy security appointee Flynn tweeting about Clinton child sex rings in pizza shops is as fringe as it gets!) does not mean Trump only appeals to people with fringe beliefs.
Saying redheads like Trump does not mean only red heads like Trump.