You either have a complaint for systematically being ignored or you don't. There isn't a middle ground. It's black and white: you were or you weren't. There are methods of getting these things investigated and handled [0]. In some cases, it is very easy to tell when you are being discriminated against [1].
If it cannot be proved - and investigations prove otherwise - that discrimination did not take place, the feeling of being discriminated against does not mean discrimination took place. Otherwise someone could pull the race/gender card each and every time they weren't hired, regardless if the reason was they were underqualified/not the right fit/blah blah blah.
The systematically of _pius' post is almost certainly used in the sense of "resulting from structural discrimination", which is a much larger and insidious beast because there's absolutely ingrained biases and entrenched policies that end up selecting away minorities in ways that can't be effectively shown in court.
If it cannot be proved - and investigations prove otherwise - that discrimination did not take place, the feeling of being discriminated against does not mean discrimination took place. Otherwise someone could pull the race/gender card each and every time they weren't hired, regardless if the reason was they were underqualified/not the right fit/blah blah blah.
[0] http://www.eeoc.gov/employees/howtofile.cfm
[1] http://www.nytimes.com/1997/10/01/us/hooters-settles-suit-by...