Declan Rice appeared to turn around and taunt the Tottenham fans after Arsenal scored from his corner.
The Gunners midfielder received plenty of stick from his rivals' fans as he prepared to take the set piece, with a section of supporters seen shouting at him.
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He quickly made them regret it, though.
Rice's corner ended up meeting Kai Havertz, who rose the highest to head past Guglielmo Vicario to make it 3-0 with 10 minutes still to go to half-time.
As the ball hit the back of the net, Rice quickly faced the disgruntled home fans who had been shouting at him as he celebrated.
Rice has cemented himself as a Gunners fan favourite since signing from West Ham last summer for £105million including add-ons.
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He's made 47 appearances in all competitions, netting six goals and bagging eight assists in that time.
Bukayo Saka had already rubbed salt in Spurs' wounds this afternoon with his own gestures at the home fans when the Gunners went 2-0 up.
First, his corner forced his fierce rivals to concede an owl goal, with Pierre-Emile Hojbjerg sending the ball into his own net.
Saka then got himself on the scoresheet to double his side's lead.
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The Gunners lost their cleansheet as David Raya fired a goal-kick straight at Cristian Romero, with the defender chesting the ball before slotting past the Gunners goalkeeper to make it 3-1.
Rice was then left shaking his head as he gave away a penalty with less than 10 minutes to go, kicking Ben Davies in the back of the leg.
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Captain Heung-min Son then converted from the spot to make it 3-2, but the home side failed to find an equaliser int he end.
Arsenal are now four points clear at the top of the Premier League, with second place Manchester City set to play Nottingham Forest, one of their two games in hand, later on Sunday.