An openly gay Princeton University freshman put Supreme Court Justice Antonin Scalia on the spot during a Q&A period on Monday.

Duncan Hosie questioned Scalia about his dissent in Lawrence v. Texas, a 2003 Supreme Court ruling that struck-down anti-sodomy laws and made same-sex sexual activity legal nationwide.

In his dissent, Scalia argued that the court should defend laws forbidding acts that are “immoral and unacceptable.” He lumped same-sex marriage and gay sex in with things like bestiality, incest, and even murder.