Contempt for non JWS varies and it is mentally reinforced by the doctrinal teaching that non jws are evil unrighteous people separate from themselves, who are therefore deemed dangerous toward their own self identifying spirituality.
ie. bad associations = non members
good associations = other jws members in good standing
Thats why associations and friendships with non members are not recommended and discouraged.
This even extends to family members who were once associated with the organization, these relationships are intentionally broken off completely as its been documented.