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Alves had a brilliant response - he peeled the banana, ate it, and took his corner kick.
After the game he explained, "It's been happening for 11 years, we can't change it, so best to treat it as a joke. If we give it no importance, they fail."
As Alves gesture spread throughout the soccer world, other players showed their support by posting pictures of themselves eating bananas on Instagram.
The photos are tagged with "Somos Todos Macacos" - which means "we are all monkeys" in Portuguese.
It's now a meme.
Neymar, who plays with Alves on both Barcelona and the Brazilian national team, posed with his son:
Manchester City's Sergio Aguero and Brazil's Marta took a picture together:
Hulk, another Brazilian international, took a picture with his ENTIRE FAMILY:
Chelsea's David Luiz, with fellow Brazilians Willian and Oscar:
Brazil legend Roberto Carlos:
Now regular people are getting in on the action too: