Maybe if all you ever exchanged with someone was a few sentences about inconsequential stuff. ChatGPT isn't even close to being able to consistently act like a single human being with interests, plenty of long term memory, and a life outside a chat room.
Right now the performance of ChatGPT in your average discord chat room would be absolutely awful. Nobody is bothering to write their messages as proper prompts a state-of-the-art AI could understand. People don't even just talk about one thing at a time - having multiple threads of conversation interspersed with each other is quite common and would absolutely confuse any current AI. There's also in-jokes and subtle references to things said days ago. People try to only use minimal information to convey what they mean, and often make figuring that out a small puzzle/joke to keep the conversation interesting.