Is it illegal for strangers to always say hello to you?

Breaking the law is a violation of the legal system stipulated by the state. It's not illegal to say hello to you. The perpetrator insults others through words, which may violate the Law on Public Security Administration Punishment. If the perpetrator publicly insults others, or repeatedly sends obscene, insulting, threatening or other information to interfere with the normal life of others, he shall be detained for not more than five days or fined not more than 500 yuan; If the circumstances are serious, they shall be detained for not less than five days but not more than ten days, and may also be fined not more than 500 yuan.