Is it illegal to go to a friend's house and be stopped by the community security guard to watch and chat?

It is illegal to go to a friend's house and be stopped by the community security guard to watch the chat. You can call the police. The legal consequences of infringing on others' privacy generally do not violate criminal law, but they will be punished by public security management and bear civil liability according to the seriousness of the case.

Infringement of personal privacy is a civil tort and an illegal act of public security management. If the consequences are serious and involve criminal offences, criminal responsibility shall be borne. If it constitutes a civil infringement, the person whose privacy right is infringed may ask the other party to stop the infringement, eliminate the influence, apologize and compensate for the losses.