Racism is going to exist in ME regardless if you're a cute geth or a bucket head alien. Notable example is Ashley Williams.
Notable example is the whole damned galaxy. Most of Ashley Williams' supposed racism is making observations that are constantly being proven true. This is a setting in which one of three races with actual political power used another sentient race as cannon fodder to fight a war, and then created the genophage to cause millions upon millions of stillbirths to that race when they became problematic. Only three races in the galaxy have representation on the almighty Galactic Council, which, as already mentioned, is capable of decisions that would make Josef Mengele smile from his little corner of Hell.
At times, there seems to be a peculiar notion that Humanity is the only possible source of racism. The galaxy was awash in racism long before the Turians started killing members of a previously unknown race for pulling the wrong lever. Williams expresses concern that the Council races may not have Humanity's best interests at heart, and that makes her racist. I'd say it's more applicable to people who do experiments on other races, use them as disposable shields, and deny them access to a political process that governs them.