The image does in no way try to depict ignorance, it is a well known meme for use in exactly the context it has been used here: It literally says "well I do know some of the terms used in this text or statement, and I do maybe have a certain amount of knowledge in this topic, but to be honest the whole thing was pretty much over my head because it's way more in-depth than I currently am in this topic".

Also, it is originally taken from a movie, Good Burger (1997) and only one of many quotes from this movie. The fact that the depicted actor is black does not have any relation to the symbolic meaning of the meme.

End of random trivia, not trying to lead a discussion or something, just thought some might find this interesting.
Also, sorry for off-topic, if that's even possible.