When using a chat client, I was using Adium, to connect to partychat, partychat recognizes capitalized usernames, while googlechat seems to not care.
Problems arise when you log into gmail to chat, it doesn't recognize that you are indeed in a room, as you are someguy@gmail.com not SomeGuy@gmail.com. Although it does recognize that you have partychat as a contact.
Joining the room again causes two instances of the same account to be in a room. Resulting in multiple messages being received from chats.
And this does not seem to be solvable from the client side, as when I log into partychat from my IP, even with other clients it automatically uses the capitalized version aka SomeGuy@gmail.com not someguy@gmail.com, no matter which I log in with.