Some scholars insist that refers to former Christians who have deliberately gone way and persistently over the line into overt and rebellious apostasy.
Romans 1:27-28
And likewise also the men, leaving the natural use of the woman,
burned in their lust one toward another;
men with men working that which is unseemly,
and receiving in themselves that recompence of their error
which was meet.
And even as they did not like to retain God in their knowledge,
God gave them over to a reprobate mind,
to do those things which are not convenient