"I wanted to make that team so badly because it's such a huge honor," Thompson said during an appearance on ESPN's The Jump.
Not being named All-NBA means the three-time NBA champion is ineligible for the supermax extension.
Thompson would have been eligible for an estimated $220 million extension if he made an All-NBA team, but will instead max out around $190 million on a five-year deal this offseason, per Jon Becker and Mark Medina of the Bay Area News Group.
Anthony Slater @anthonyVslater
Klay Thompson learns he didn’t make All-NBA (“Oh I didn’t?”) and is clearly a little ticked (it affects his next contract): “When you go to five straight Finals, it takes more than a couple All-NBA guys...Do I think there are that many guards better than me? No.” https://t.co/bW5DiBavo1
Although there was speculation the $30 million loss was the reason for his frustrated initial response to the news, the guard's father, Mychal Thompson, told Tim Kawakami of The Athletic that wasn't the case.
"Everybody is saying it's about money, but it's not," the elder Thompson said. "It's about recognition for his two-way contribution."
Among guards, he ranked 29th in Win Shares, 49th in VORP and 60th in Box Plus-Minus, according to Basketball Reference.
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Thompson can become an unrestricted free agent at season's end and could look to prove himself as a bona fide superstar by joining a team where he'd be the go-to player offensively.
Leaving an annual championship contender like Golden State comes with its own set of risks, though.