Frank Blake, the retired CEO of Home Depot Inc., (HD)  came across as the green-eyed monster of retail on Tuesday morning.

Apparently not keen on Amazon.com Inc. (AMZN) , Blake called the online retailer a "dark star" at an e-commerce panel in Atlanta on Tuesday, Aug. 15.

"I really don't like Amazon," he added, going on to criticize the tech giant's answer to Apple Inc.'s (AAPL)  electronic, interactive "personal assistant" Siri, which is called Alexa.

 Amazon and Home Depot are direct competitors in home improvement products, including lumber and furniture.

Amazon uses Alexa to spy on customers, Blake joked, a conspiracy theory that isn't exactly new. 

While the jury is out on what exactly Alexa's obliging velvet voice is capable of, Amazon does, in fact, keep transcripts of users' conversations with the device. Amazon is now deciding whether to give developers access to these transcripts. 

Blake told the audience at the Rotary Club of Atlanta Tuesday that Alexa also shows a preference for Amazon's products when it fulfills orders, which could mislead customers into opting for a lesser deal.

Frank Blake, retired CEO of Home Depot.
Frank Blake, retired CEO of Home Depot.

"Every retailer is going to have to figure out its strategy for dealing with Alexa," he added.

While envy may not be a cute look for Blake, his old stomping grounds, Home Depot,  is killed it last quarter. It posted a same-store sales increase of 6.3% and Q2 earnings of $2.25 per share - exceeding Wall Street estimates by a pretty margin. 

A spokeswoman for Amazon told TheStreet by email on Thursday, Aug. 17, that Alexa does not promote Amazon products first. She wrote: "Alexa surfaces offers to voice-shopping customers via Amazon's Choice. Amazon's Choice recommends highly rated, well-priced products that ship immediately. These are not always Amazon's products. Additionally, if you've ordered something in the past, Alexa will surface that product first."

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