What was the feud between Tom Hall and Adrian Carmack?

[Amaruψ]

Pardon me if this has been asked before, but has there ever been a word on what was the reason behind the inclusion of the "Tom is King" and "Jules Sucks" textures in the earliest iteration of DOOM? Given that there's even a 3rd one of them which proclaims "Tom is Shit", I'm not quite aware if I've found out any reason why there would be a rivalry or a feud between both (and my searching skills definitely are bad... so is Google's search engine.) 

 

Could be perhaps a friendly jab at each other, instead of an actual feud?

[Pechudin]

I heard something about Adrian being sick of drawing cutesy stuff (like the Commander Keen) and Tom, being the creative lead, making him do it. But I am unsure.

[aRottenKomquat]

From what I recall from Masters of Doom, Tom Hall preferred cartoon-style graphics like Commander Keen, while Adrian wanted graphics that were darker and more horror-inspired. So it was just creative differences.