This is hardly a redefinition as much as a clarification of intent and context. Saying that it's a "crime against understanding" is a bit of an exaggeration.
I mean, saying that racism is "prejudice" is what Dictionary.com says, and saying racism is "prejudice with power" is what a sociologist says, then can't you figure it out with context? Dictionary.com says gravity is, "the force of attraction by which terrestrial bodies tend to fall toward the center of the earth." but a physicist would probably have a different definition they think is more accurate.
I definitely wouldn't say that Adria was right in this whole incident, but picking apart the rest of her Twitter history like it's some sort of way to establish how much you should dislike her is the wrong approach to making things better.