Why Jehovah witness people discriminate other who aren't witnesses?

A user here who is a Jehovah witness I had no choice but to reported her account for talking shit about Catholics.

Today a Jehovah witness Karen yelled at me called me the son of the devil for goofing off shaking my ass making my girlfriend laugh.

But Karen got so mad at my girlfriend and I called us worldly.

Why Jehovah witness get offended over everything?

Why Jehovah witness people discriminate other who aren't witnesses?
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