Of course they will be racist and sexist... they'll probably have a log of race and sex of those they see. That information is probably useful to know your customers and learn what to sell; it seems useful.
Arguing against the mainstream position can even get your comment flagged. Doing it a few times (even about unrelated topics) will get your account banned for being "incendiary". HN is an echo chamber. But that's not surprising, all Internet communities are an echo chamber to some point.
That is your opinion. You'll find that many people disagree. Maybe not here, in HN, openly.