A DESCRIPTION OF THE PROBLEM :
add to the beginning of the function
java.util.Collections.disjoint(Collection<?> c1, Collection<?> c2)

if(c1 == c2) return false; // same collection. All match
if (c1.isEmpty() || c2.isEmpty()) return true; // At least one collection is empty. Nothing will match.


Justification:
This small minor changes will easily improve run-time.
Specially for the case of (c1 instanceof Set) && (c1.isEmpty()). In which case:
  iterate = c2;
  contains = c1;

and then we perform O(c2.size()) unnecessary operations of
  for (Object e : iterate)

which is surly to be false for contains.contains(e), as variable contains (contains == c1) is empty.