Requested HR to be present during heated conversation with boss & he said no...

My boss & I were in a very heated debate, I felt it was going to far & requested HR to be there if he wanted to continue the conversation & he bluntly said no... I haven't talked to my HR about it yet because the situation happened on Friday evening... I just want to know my rights & what to expect

Requested HR to be present during heated conversation with boss & he said no...