The crows don’t represent the worst we’ve seen from Disney, as Dumbo isn’t quite on the level of Song of the South, but they do lean heavily into African-American stereotypes.
There are a couple of sequences in Dumbo that simply haven’t aged well.
The first, you may very well be familiar with, as it has become one of the more notorious sequences in the Disney canon.
That sort of thing wasn’t uncommon in the 1940s, but looking back on it we can see it’s wrong.