My guess re:the feud is that one egomaniacal junkie white jazz superstar (not playing the race card, but to be a white jazz superstar in those days was a whole 'nother sociological thing than it is now) is twisted enough. Put two in the same room...
And IIRC, neither Getz nor Baker got along well w/Art Pepper, another egomaniacal junkie white jazz superstar. These three all made beautiful music but were basically phukked-up human beings, probably with not a little self-loathing involved somewhere in the mix. You take somebody like that, they see somebody who is VERY much like themselves in a lot of ways, and the self-loathing (and fear, which goes back to the white thing - a big part of being a white jazz superstar back then was the whole "that white boy's got SOUL!" thing, and you're really supposed to be UNIQUE in that regard, but here's somebody else who shows you that you're not TOTALLY unique, so may you're a fraud, or he is, or you BOTH are, so here comes the self-laothing again...) goes off the meter, both inwardly and outwardly...
Shouldn't you be asking Dr. Freud about stuff like this?