Final answer:
The Tsonga response to witnessing European colonizers kissing romantically in 1890 can be characterized as culture shock.
Step-by-step explanation:
The Tsonga response to witnessing European colonizers kissing romantically in 1890, which reportedly involved surprise and horror, can be characterized as a cultural difference or phenomena known as culture shock. Culture shock refers to the feelings of disorientation, confusion, and discomfort that people experience when they encounter unfamiliar cultural practices or norms.