I replied to a post stating that teachers work 55 hours per week 48 weeks per year by saying I know plenty of teachers and none of them work 48 weeks per year (I didn't dispute the 55 hours per week). You responded by saying the people I know "aren't good teachers" (denigration). The manifest ignorance was assessing negatively a group of people about whom the only aspect of their performance you know is that they don't work 48 weeks per year
