The newly-formatted competition, which was formerly the Copa Catalunya, is held each year and is played between clubs from the Catalan region, but the Camp Nou side have called the game off this year due to a congested fixture list and risk of injury.
The Espanyol official feels that the Blaugrana have shown disrespect for their neighbours with the decision.
“Barcelona have shown a lack of respect for Catalan football, for Espanyol and the [Catalan Football] Federation. It is a sad day for all,” Collet told Marca.
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“The message that Espanyol want to send out is that we are 100 per cent committed to Catalan football.
“It seems we always have to do more than necessary to prove this and others perhaps do not do the same.
“We as a club often have to show who we are, and no one can question our commitment to Catalan football," he concluded.
The match had been scheduled for Tuesday July 31 at the Estadi Olimpic.