This is a complete storm in a tea cup.
Pep didn't mean it in a disrespectful way whatsoever. If you actually watch the footage, he's got a big grin on his face when he says it. If anything, he was complementing Kane, not taking the piss out of Spurs. It was intended as a compliment.
Again, if you actually see Pochetino's conference today, he's not angry or especially offended. He's actually smiling and in a good mood when talking about it. He's probably using it as a tactic to motivate his players and have a dig at Pep.
Both comments look far worse on paper than when you actually see the footage. Not like the written press to overhype something!