Change my mind.
The best part about that idea is that Squidward existed prior to the generally agreed-upon “lower limit” of the Millennial (SpongeBob started in 1999; most of the definitions of “Millennial” I’ve seen use the birth year range of early 1980s to early 2000s). This means that many Millennials grew up on a healthy dose of SpongeBob.
Perhaps we imprinted on Squidward! There’s your scapegoat, angry and critical Boomers. ‘Twas SpongeBob Squarepants all along.