I think what they mean is that because of their experiences they have less
tolerance for hostility than you do.
Most of the time people are verbally hostile towards you nothing terrible ends up happening so you eventually learn to ignore minor hostility. However if you had the sort of bad experiences minorities have, you would learn to be wary of minor hostility, as it is often the precursor to major hostility or even physical harm.
You know how evolutionary psychologists often attribute human stupidity to adaptations that made sense in prehistoric times? Like your instincts tell you sugar is good for you because it used to be found mostly on fruit and nutritious berries, but nowadays the instinct leads you to eat junk food. In the modern world sugar has nothing to do with high food quality (just the opposite) but the instinct remains.
For minorities, their instinct to recoil at minor hostility is like that, except that instead of an ancient adaptation to deal with the life at the Savannah, it is the habit that helped you keep your sanity this very morning at the office when your asshole coworker yelled at you. In Stack Overflow nobody is going to yell at you or punch you or try to get you fired, but the instinct remains.
Most of the time people are verbally hostile towards you nothing terrible ends up happening so you eventually learn to ignore minor hostility. However if you had the sort of bad experiences minorities have, you would learn to be wary of minor hostility, as it is often the precursor to major hostility or even physical harm.
You know how evolutionary psychologists often attribute human stupidity to adaptations that made sense in prehistoric times? Like your instincts tell you sugar is good for you because it used to be found mostly on fruit and nutritious berries, but nowadays the instinct leads you to eat junk food. In the modern world sugar has nothing to do with high food quality (just the opposite) but the instinct remains.
For minorities, their instinct to recoil at minor hostility is like that, except that instead of an ancient adaptation to deal with the life at the Savannah, it is the habit that helped you keep your sanity this very morning at the office when your asshole coworker yelled at you. In Stack Overflow nobody is going to yell at you or punch you or try to get you fired, but the instinct remains.