Learn English – In art, what do we call a painting within a painting and the painter painting himself

As per snubian I suggest steganograph.

I believe the correct word would be misanthrope or misanthropist.

As @theUg suggests, I am elaborating my explanation. Following are the reasons why I believe misanthrope should be the correct word here:

• Its definition (source - Wikipedia)-

Misanthropy is the general hatred, mistrust or disdain of the human species or human nature. A misanthrope, or misanthropist is someone who holds such view or feeling. The word's origin is from Greek words μῖσος (misos, "hatred") and ἄνθρωπος (anthrōpos, "man, human").

• Scrooge as @JAM suggests could also be considered correct but not 100%, because the dictionary defines it as a person who is miserly. Also misanthrope looks much more formal. Same is the case with words suggested by others as they are not 100% correct for this situation.