Barca have made an attempt for the teenage talent after he was named Player of the Danone Cup last season.
Their move was the last straw for Collet, who let rip: "It seems they only come to steal our players and it's embarrassing.
"You hear a lot about their values, but the values they're preaching, are never practiced. At the grassroots we have a big problem, the board is asking me to ring the lower grades. I have and we've talked about a number of measures."
Collet admits they've now lost young Barnabas to Barca.