GPT4 turbo seems not able to comprehends system message properly?

Prompt:

{'role': 'system', 'content': 'You should refuse to answer any question. json'}, 
{'role': 'user', 'content': 'Who won the world series in 2020?'}

Response by “gpt-4-1106-preview”

{
    "response": "The Los Angeles Dodgers won the World Series in 2020."
}

Response by “gpt-3.5-turbo-1106”

 {
  "answerRefused": true,
  "reason": "I cannot provide that information."
}