AC Milan chants against Inter Milan

It was a high-octane match full of emotion at San Siro where AC Milan won 3-2 against crosstown rival Inter Milan to take the first Derby della Madonnina of the season.
September 3rd 2022
AC Milan 3-2 Inter Milan
Goals: 21' Brozović (I), 28' Leão (M), 54' Giroud (M), 60' Leão (M), 67' Džeko (I)

[@Sunset4633]

How did that inter fan end up in the AC fans stand 😂😂