Puzzled fans took to social media to solve the mystery of the Swiss' grim mood.
The 34-year-old did not play a single minute in the match but managed to send the Gunners fans into frenzy with his hilarious celebration after Alexandre Lacazette's second-half goal.
Lichtsteiner also squared up to Moussa Sissoko after Eric Dier's equaliser.
The Swiss, however, appeared to lose his enthusiasm when the team decided to pose to a commemorative photo in the dressing room.
And that completely bewildered Arsenal fans.
One, cemlouire, asked on Instagram: "Why Lichtsteiner so mad?".
Another, craigyyy13, added: "Stephan Lichtsteiner's face – you thinking about chewing up Eric Dier again?".
But @BiggarsInParis came with an explanation on Twitter, saying that Lichtsteiner "left the chicken in the over".
@DanArnold1691 summed up: "Lichtsteiner is a scary dude, never seen him smile," and called him a terminator.
Arsenal fans were disappointed that the derby hero – Lucas Torreira, who scored his first goal for the Gunners against Tottenham – did not make it into the photo.
Interestingly, another absentee was Aaron Ramsey whose expiring contract will not be extended by the club.
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