many players like to test if you are a bot by sending you a emote and see if you answer or take any notice of it, and if you don't respond they can get suspicious and may end up reporting you.. and that as we all know is the easiest way to get banned for botting.
So I recommend you to install this little UI: Autoemote AutoEmote - Communication - World of Warcraft Mods, Addons, and More!
it will respond with a set delay, plus it got some cooldown options so you dont spam.
specially if you are doing some heavy afk gliding/botting it would be a good idea to go install this one.. also its extra useful to handle people from the opposition faction when they want to check you out.