Some chess sites (at least lichess iirc but im pretty sure that chess.com does it too) show the country of each player, so I think these are the opponents the player is being matched with
It's worth noting that you can actually opt not to show your country or choose to show a different country in the chess.com settings so this person is purposely putting the Israeli flag on their account and getting sad that people are giving them pushback on it
Some chess sites (at least lichess iirc but im pretty sure that chess.com does it too) show the country of each player, so I think these are the opponents the player is being matched with
It's worth noting that you can actually opt not to show your country or choose to show a different country in the chess.com settings so this person is purposely putting the Israeli flag on their account and getting sad that people are giving them pushback on it
If you have a free account - you can't change your flag.
Source: me.
chess.com sucks ass, use lichess