I don’t know what the rules are but why send negative messages at all? What do you think it’s going to accomplish? You think saying “fix your fckn network” is gong to make them fix their internet? Of course it won’t. So why bother? All it is you needlessly taking your frustrations out on other players. In all my years of gaming I have never felt the need to send anyone a negative or angry message. It’s just a video game. As the song says “let it go”.