There’s been no love lost across the Taiwan Strait since the self-ruled island inaugurated Tsai Ing-wen as president last week, with China ratcheting up attacks against her out of concern she’ll make moves toward formal Taiwanese independence.

One Chinese official took it further Tuesday, tying Ms. Tsai’s political leanings to her status as a single woman. Without the burdens of love and attachments of family and children, Ms. Tsai developed a political style that tends “toward emotionalism, individualization and extremism,”...