Agree. Also, see the DW Nominate scores for congress. https://voteview.com/parties/all

Liberals are at 0.38, and the most extreme they've ever been was 0.39. They have been somewhat more liberal than they were in the 40s, but they've generally been within the same band of scores for the last 100+ years.

Conservatives, on the other hand, are at 0.49, which is the most conservative they've been in the last 200 years. They've basically doubled since the 1970s.

So, objectively, conservatives are more extreme (0.49) than liberals (0.38) today. Also, the most extreme conservatives are more extreme than the most extreme liberals.