Reminder that Terezi uses lowercase letters when whispering. Her quirk isn’t messed up. She is whispering to Dirk. In the most recent update, it is likely that Tavros just uses all lower case letters when whispering like Terezi does and the random uppercase letters are just showing he is a bad whisperer like John and Vriska both say he is.
http://www.mspaintadventures.com/?s=6&p=007105
==> Submitted by kankris-privileged-peasant