How can there be a red circle without deleting each other and hacking each other's news?

1. The other party blacklists his friends. After opening the other person's "personal photo album", friends can only see a horizontal line under the other person's avatar and nickname. When a friend sends a message to the other party, a red warning symbol will appear on the left side of the message, and the message "Message sent, but rejected by the other party" will be displayed below. When you click on "Video Chat" or "Voice Chat" in "Video Chat" on WeChat, the message "The other party has blacklisted you and cannot video chat" or "The other party has blacklisted you and cannot voice chat" will appear. You need to click OK to return.

2. The other party blacklists the friend, and the friend will not be displayed in the other party's address book list, and the other party will not receive the message from the friend, but the other party will open "I-Settings-Privacy-Address Book Blacklist" on WeChat in turn to enter the blacklist list, click the nickname of the friend to open the friend's "Details" and select "Send Message" in the "Details", and the friend can still receive the message sent by the other party. If the friend has set privacy: I-Settings-Privacy-Turn off "Allow strangers to view ten photos", the other party can only see a horizontal line under the friend's avatar and nickname after opening the friend's personal photo album. If a friend turns on "Allow strangers to view ten photos", the other party can view up to ten photos in his personal album.