Cosmopolite

1. What does 'he wouldn't stand for no knockin' the place' mean?

("The man with the red tie" (that was my cosmopolite), said he, "got hot on account of things said about the bum sidewalks and water supply of the place he come from by the other guy."
"Why," said I, bewildered, "that man is a citizen of the world--a cosmopolite. He--"
"Originally from Mattawamkeag, Maine, he said," continued McCarthy, "and he wouldn't stand for no knockin' the place.")

Thanx!