If that was the case, I can certainly see how the rivalry would arise :P
Warlocks: "By the Light, I'm surprised you idiots can even find the earth! What is all of this useless crap?!
Hunters: "Woah, you guys are lucky we even went out to get this stuff for you! Show a little respect!"
Warlocks: "Respect? Respect for wasting our time? [i]Humanity's[/i] time? Bah, just scout out the area for us and we'll send a proper Warlock to do the searching..."
Hunters: "*Sigh roughly and walk away* Nerds in dresses... and these are the only guys who can figure all this complicated stuff out?"
Titans: "... Hmph."
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This is the perfect explanation.