When JFK (whatever you thought of him, the man was never a coward) asked LBJ to visit Vietnam for him in 1963, LBJ apparently physically quaked with fear. Typical reaction for a bully and a cheat. Neither the Washington Post nor CBS "News" were, of course, interested one bit in LBJ's criminality; it didn't further their political objectives.
Of course I had to ask him about it.
He said Kennedy was liked by all of them. He also said he behaved well after his boat was sunk. On the other hand he said having your PT boat rammed by a ship was considered about as bad as it gets since they were the fastest thing on the water.