He is also a Jew-hater.
Zupančič's hate isn't subtle. He doesn't hide it behind "anti-Zionism." He doesn't insist that he doesn't hate Jews. His hatred is explicit and continuous.
His former Twitter account, bmz9453, had plenty of antisemitic posts. It was closed down but his replacement account is filled with anti-Jewish tweets - even quoting antisemitic sites like The Daily Stormer and the Holocaust revisionists at the Institute of Historical Review.
Here is a selection of his tweets for just the past few months, often direct quotes from antisemitic websites like Unz.com:
Since the Ukraine war started, Zupančič has obsessively blamed the Jews for their supposed role in the war.
And he reposts the most vile antisemitic conspiracy theories he can find every day - here are two from yesterday:
Boštjan M. Zupančič was a human rights judge for 18 years. It hasn't stopped hum from openly engaging in spreading hate for Jews every single day. On the contrary - his biography gives his hatred legitimacy.