As someone who has had both academic and career success (and failures), I know I am capable as a developer and able to contribute meaningfully to technical discussions.
As a person of color, however, I have also experienced harassment by police, suspicious looks from shop owners, and outright hostility from drunken young men.
So, whenever I encounter what appears to be irrational anger or inexplicable disrespect, I cannot help but wonder and worry that I'm being poorly treated because of my race, even when I suspect that's not the case. The person who treats me poorly need not necessarily be discriminating against me because of my race, but I can never know and, of course, unless someone is calling me racial epithets such poorly behaved people are unlikely to admit bias.
It's sort of like being bullied in elementary school, and then high school, and then college, and then as a working adult. You never outgrow the bullying. Indeed, the bullying seems to get worse as one matures and loses the youthful physical characteristics which people often read as non-threatening.
So regardless of intention (and sometimes because of it), feeling discriminated against can be partly the result of lifelong experience and is probably fairly characterized as a form of post-traumatic stress disorder.
EDIT: remove two instances of repeated "as"; add "often"; remove comma; change pronoun.