In defense of the guy that brought it up: race-mixing is a huge scissor statement. It's already working here - you're getting your socks in a tizzy over a mention of it and can't get past the object-level. The meta-level is it doesn't matter what concept they use - race, gender, sex, identity - posters can and will use it to make you fight people you would otherwise get along with.
Now that the drama is over and I won't be accused of lying, I'd like to point out that I'm European and a child of a mixed marriage myself. So the reaction of this wannabe Jihadi John SJW is even more troubling.
As for the scissor statements, here's another good one: 'Women have smaller brains than men'. It is true (on average) but it will draw out mouth-frothing SJWs without fail.
