Ugly
Explanation
This comic is a dark joke about ugly sweater contests taken to their logical extreme.
A man wearing a sweater emblazoned with a swastika declares: "Check. MATE." -- implying he believes he has won the ugly sweater contest with an unbeatable entry. His coworkers look uncomfortable and horrified.
The caption reads: "The office no longer permits ugly sweater contests."
The humor comes from the deliberate conflation of "ugly" (aesthetically displeasing) with "ugly" (morally repugnant). Ugly sweater contests, a common holiday office tradition, are meant to celebrate kitsch -- garish colors, silly patterns, gaudy decorations. The man in the comic has taken the word "ugly" literally and to its furthest extreme, choosing the ugliest symbol he can think of: a Nazi swastika. His triumphant "Check. MATE" suggests he genuinely believes he has found an unbeatable strategy, treating a lighthearted office tradition as a competition to be optimized.
The joke is less about the symbol itself and more about the type of person who would apply ruthless min-maxing logic to a casual social event, completely missing the spirit of the activity. The office's response -- banning ugly sweater contests entirely -- reflects how one person taking things too literally (or too far) can ruin a harmless tradition for everyone.