He shouldn't talk to them because we do not officially recognize the Taiwan government. China isn't butt hurt because they realize the Taiwan leader pulled one over on Trump. Taiwan even publicized the call. Not a smart move by Taiwan, IMO. Trump doesn't like to look bad and he holds grudges.
This was a major concern with Trump. Diplomacy is a delicate subtle art. Every word counts. This is different from business dealings. He needs a close advisor who is adept at foreign diplomacy who can screen his calls.
He needs to take his briefings seriously...too many reports now that he isn't listening.