Misanthrope
/ˈmɪsənθrəʊp/
Definition 1 of 2
Pro Tip 1/3Negative Tone
Using 'misanthrope' often implies negative feelings towards social interactions. 
He's such a misanthrope, always avoiding company events.
Pro Tip 2/3Not Necessarily Rude
A misanthrope isn't always rude; they may be polite yet prefer solitude. 
The neighbor is polite but a misanthrope, greeting us but never accepting invitations.
Pro Tip 3/3Subtle Avoidance
Misanthropes might subtly avoid others, not always through direct confrontation. 
She gave excuses for each meeting, a true misanthrope at heart.