I've never understood why, in the Eternal September, anyone would expect the average late-night conversation on the internet to be any different from the average late-night conversations at the local pub. Sure, you might find that rare table of PhD students/young engineers/residents/academics and teachers/etc. having a genuinely interesting conversation as they transition from work to relaxation after a long night at the lab/hospital/grading. But mostly it's drunk idiots relishing in base pleasures. And after the second drink or so those engaging conversations will devolve.
I don't think Twitter is encouraging anything in particular here. The same thing happened with IRC channels, forums, etc. No point in getting angry or sad about the Eternal September; it was always inevitable.