That strikes me too. Why do points made by Derecon this board invariably trigger ad hominem against Derec instead of addressing his points?
Because he has exhausted people's reserves of tolerance. Persistent racism leads to the presumption of racism. It may not be fair, but that's how it goes.
A hypochondriac arriving at the doctor's office for the hundredth time this year will be given a very cursory examination and told to go home. In principle, he should be treated like every other patient, and his concerns carefully assessed and tests ordered to help to establish a diagnosis; But when the last 99 visits lead to a diagnosis of hypochondria, the temptation for the medical staff to just say 'fuck off and stop wasting our time with your bullshit' becomes very strong.
Nobody is interested in picking apart the details of Derec's arguments, to see if this time, for a change, they are not founded in racism, misogyny, or both.
That's the price you pay for persistent bigotry. After a while, nobody cares whether you might have changed your tune, they just don't want to listen to any more of your bullshit.