Pipes boy is at best an ignorant moron to use McCarthy as a pejorative. It is more likely he is being deceitful in furtherance of Deep State aims.
McCarthy was right.
Blacklisted by History: The Untold Story of Senator Joe McCarthy and His Fight Against America’s Enemies
https://www.amazon.com/Blacklisted-History-Senator-McCarthy-Americas/dp/1400081068
You beat me to it. Barr is proving himself a progressive suck-up by his statement. He is preaching to the liberal choir. If he wanted to challenge them, he would say that they are continuing to prove McCarty right. Instead, he sings their tune. In his depraved heart, he knows no other.