Is it rude/offensive to refer to modern Jewish people as "Hebrews?"

My elderly father and I (both gentiles) were watching Jeopardy! a few months or so ago and Mayim Bialik was hosting. He kept calling her “Maya” and I corrected him saying it was “Mayim,” explaining that she is Jewish. He then said “I didn’t know she was a Hebrew!” and it kind of rubbed me the wrong way.

Was what he said offensive? Thank you to anyone who reads or replies 💗