Elvis hated Goulet's style of singing, which he considered emotionless. But also it went back to while Elvis was in the army, Goulet relayed to Elvis that he shouldn't worry, that he was "taking care of" Anita Wood back at home for him.
I've read something about Elvis not responding too favorably to commercials for the products you mentioned as well. I seriously doubt he destroyed the TV every time one came on though. Though certain things may have happened with some regularity, generally speaking, if Elvis did one outlandish thing once, the legend becomes that it was a daily ritual for him.