The speaker apologizes for previously making a blanket statement that extroverts sound like morons and clarifies that talking too much can create opportunities to say something imprudent, but does not mean extroverts are stupid.
A person insults the listener, telling them they are not as good as someone else and calling them names.
The process of changing behaviors is challenging and can be compared to rehabilitating from a severe brain injury as both require an arduous and painful journey to achieve results.