Any person in MyChat can ignore other users due to various reasons. It can be done by a tool "Ignores" in MyChat Client":

 

Ignoring users in MyChat

 

If you ignore a user in a chat (completely or partially), then you won't receive some types of messages. But if this user is an administrator or supervisor you won't receive important messages from them either.

 

To avoid such misunderstandings, you should add administrators and supervisors to a Rights Group with a rule "Ignores immunity".