You don't have to go point by points just regularly say "everything he just said is horseshit" and get back on message. Satisfies people who give a shit about lying without falling unto the trap of wasting your time trying to catch him in a lie when his supporters obviously don't care.

Also Biden "calling him out" would be a lot more effective if it wasn't him going "listen man... i.... what he just said... look... when you look at the records... I know... uhhhh. That's my time."