Retiring Massachusetts Rep. Barney Frank says Supreme Court Justice Antonin Scalia is “a flat out bigot.”

The 72-year-old Frank has the distinction of being the first openly gay member of Congress and the first to enter a marriage with a member of the same sex.

When asked by The Huffington Post his thoughts on Scalia's recent comparison between gay sex and murder, Frank said he was glad Scalia was being honest.

(Related: Antonin Scalia defends comparing gay sex to murder.)

“I was glad that he made clear what's been obvious, that he's just a flat out bigot,” Frank said. “I'd previously said he was a homophobe. And Fox and the right wing said, ‘Oh just because he's not for same-sex marriage? And I said, 'No, let me be very clear. That's not it. This is a man who has said you should go to prison for having sex.' It was an extraordinarily abusive sentiment and it was dead wrong. And, by the way, for a guy who is supposed to be so smart – quite stupid. This young man said to him, 'Why do you compare sodomy to murder?' And he said, 'Well because I have a right to say if I think something is immoral.' Well the question wasn't about his right. The question was, 'By what morality is expressing your love for someone in a physical way equivalent to killing that person?' It makes it clear that the man is an unreconstructed bigot, and given that you have a bigot on the Supreme Court like that, it is useful to know.”

(Related: Paul Scalia, Antonin Scalia's son, promotes chastity for gay Catholics.)