I think there's two kind of campers.
The ones that know they camp because they think others are better and it's their only chance to win. They don't really give a fuck about others calling them campers.
And the ones that need it to higher their fragrate and they are persuaded that they are not campers. When you call them that they'll get mad and try to deny it some way or another
I figured the best way to play against a hardcamper is to find another way to go, just ignore him and he'll leave after 1 hours and 2 kills.