"I do not accept this court's authority," said a defiant Yishai Shlissel, representing himself at a hearing.
"This court is part of the mechanism of evil," Haaretz newspaper's website quoted him as saying at the Jerusalem magistrate's court.
"I have no interest in cooperating at all. I do not recognise any of the regime's institutions," he said.
Police said Shlissel's detention was extended for 12 days.
In a court in southern Israel, police were taking a 41-year-old orthodox Jew for a remand hearing, after arresting him overnight for a social media posting in support of Schlissel's attempted murders.
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Police said the suspect, a resident of southern city Kirya Malachi whose name was withheld, was to undergo a psychiatric evaluation.
He had told police arresting him that he would continue inciting against homosexuals, and it was his dream to be famous.
Last night Shlissel stormed the parade with a knife, attacking six before being quickly arrested amid pandemonium in Jerusalem's city centre.
A 17-year-old woman remained in serious condition while a 26-year-old man was stable. Four others had light to moderate injuries.
Shlissel was released from jail three weeks ago after having served a 10-year sentence for wounding three marchers in an attack on a Gay Pride parade in 2005.
Shlissel had posted a letter on the Internet speaking of the "abomination" of a Gay Pride parade being held in the Holy City and the need to stop it, even at the cost of one's life.