The d-bag had an invalid license and expired plates... that's why he was stalling.
From a link to an online news article found in the YouTube comments below the video:
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The exchange leading up to the window smash appears typical of encounters between law enforcement and so-called "sovereign citizens"—a small but growing movement of people who deny that they are subjects of state or federal government.
"You are being detained."
"For what reason?"
"Because you were violating the speed limit."
"Speed limit is not a crime in the state of Texas."
"It is."
"No it's not."
That doesn't stand up to the Texas transportation code, which allows government to enforce speed limits. He also claims the 1979 U.S. Supreme Court case Brown v. Texas established that law enforcement was not allowed to demand a citizen's identification unless he was seen committing a felony. This also is inaccurate—the case established that officers needed probable cause to detain and ID a citizen. Speeding qualifies as probable cause.
David Margulies, a spokesman for the Addison Police Department, said the officer was "absolutely" in the right so break the window.
"[Richardson] did not comply with the lawful order from the police officer repeatedly and the officer is permitted to force him to comply."
Richardson, who apparently posted the video to YouTube, could not be immediately reached for comment.
He was arrested and charged with driving with an invalid license, having expired license plates and failing to present his driver's license upon demand. The officer issued a warning for the traffic violations.
When Texas driver refuses to ID, police officer smashes window to remove him from the car - Houston Chronicle