For many people, discrimination does not exist on a scale of 1 to 10. Rather, it's either a 0 or a 10, with no in-between. You're either enslaved, lynched, have laws against you, etc. or it's just not discrimination.
These people are inadvertently admitting they wouldn't do much to stop things like racism, if it weren't for the history behind it. Basically, they would ignore or even partake in racism, if racism had no history of slavery or murder or corrupt laws. They would ignore wage gaps, insulting stereotypes, negative media portrayals, eugenics, and general everyday animosity, because "it could always be worse."
This black and white mentality is called the fallacy of relative privation (read more here).
Funnily enough, whenever these people have an issue, all of a sudden they don't compare themselves to others who have it worse. People get grossed out and complain when their restaurant order has a hair in it, without thinking about all those starving orphans who couldn't care less. People get depressed or angry when they're cheated on or dumped, when there are others who struggle to have a relationship in the first place. Depression and other mental health issues are taken seriously in modern society, when there are people living in war zones right now.
To me, all of this is okay because not everything has to be a serious problem or a non-issue. In fact, forcing men to shut up everywhere except in therapy no doubt contributes to the high rates of suicide in males. Speaking of mental health, I do find it peculiar how society takes this seriously until height is brought into the suicide discussion. Then nothing matters unless you're enslaved or killed first.