Slang is never appropriate to use in social situations

I don't know what the question is but. That is true because using slang would be very disrespectful. Especially towards older people.

If this is a True or False question then i would assume the answer is True

Slang is not appropriate to use if talking to someone such as an adult. Since that would be extreamly rude or impolite to some people. Slang would be more appropriate to use infront of friends, siblings etc.