I'm not entirely sure whether this a joke or not but if it isn't, please report it. If they killed you like in PvP or something but swore at you continuously, please report it here: http://www.itsjerryandharry.com/forums/other.34/
However if it's in Skyblock or Peaceful Survival and is burning you or to killing you, please report it here: http://www.itsjerryandharry.com/forums/scamming-griefing.32/
For the cussing part; Go to %appdata% .minecraft and then the logs file. I recommend using 7-zip, but winrar also works. Open with either 7-zip or winrar (the log file of the date this occurred) and find the chat part. Copy and paste it with other sufficient evidence.
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