people /person

[Anonymous]

They are a bad person.
They are bad people.
Which one is correct?

By the way, can we say someone is a "people person?"
Is that informal?

[Casiopea]

They are a bad person.
They are bad people.
Which one is correct?

By the way, can we say someone is a "people person?"
Is that informal?

They are bad people. (plural "They" and plural "people")
S/he is a bad person. (singular "S/he" and singular "person")

S/he is a people person. (OK) It's neither informal nor formal; it's just a description. It's often used in business. :D

All the best, :D