This also works on places like HN. I will often make an argument in my normal, working class low educated redneck hick sort of writing style. People will assume I have an unsophisticated basis for my argument and are way more likely to debate me on it. They like to attack an 'easy' target and even better if they are culturally seen as different.

If I use my pretend upper well-to-do white guy rhetoric with precise and deep vocabulary, I can make claims with a lower likelihood someone will challenge it, even if they are equally well backed.