Open a comment's 'link' page and if you have above X karma, you can see a 'flag' link. Collect a couple of those, and you get flagged.
Likely that comment was flagkilled because it's a standard bigoted statement, known to be controversial. If you're going to make statements like that, then you really need to back them up with data. Using 'everyone knows this' and similar are some standard weasel-words that bigots use. Likewise, it was a brand new account created just for a few flamebait comments. It's not exactly honest debating.
Basically, if you are going to make an academic comment on a sensitive topic, you should take more care in how you present it.
Likely that comment was flagkilled because it's a standard bigoted statement, known to be controversial. If you're going to make statements like that, then you really need to back them up with data. Using 'everyone knows this' and similar are some standard weasel-words that bigots use. Likewise, it was a brand new account created just for a few flamebait comments. It's not exactly honest debating.
Basically, if you are going to make an academic comment on a sensitive topic, you should take more care in how you present it.