The way the aftermath of the Earth/Minbari war lingers for the good characters is something I found really striking on this rewatch; in the first season with Sinclair's "there was a time when I just wanted to kill every Minbari I saw" line and now here with Sheridan. It makes psychological sense for both of them, and of course they both get over it in different ways, but as you say, mostly only evil or at least ambiguous characters are shown to have prejudices.