I’m curious, on which issues does your dad disagree with the leftists?
In my opinion there is little or no practical difference between liberals and leftists. You might be able to eke out a distinction by saying liberals are nice or something. But when it gets down to it they’ll support leftist policies and viewpoints and vote for leftist politicians. So as a practical matter they’re in the same category.
No, he knows that his party has been taken over by crazies, but he thinks we are also crazy.