fairydragon has it right, its NOT you spamming in chat, its during a giant lag your client is spamming the server with information such as your move forward key for example and you get kicked. If I ever see one of those big lags I just remove my hands from the keyboard and let the server come back.
"The purpose of training is to tighten up the slack, toughen the body, and polish the spirit." Morihei Ueshiba