Not only does Todd Howard not hate Obsidian, it was his 'only choice' to take up Fallout's reins in the wake of Fallout 3
There's a type of myth that survives not because there's any evidence for it, but because it flatters the preconceptions of a particular group of people. Take the notion that Todd Howard, head honcho over at Bethesda Game Studios, clearly seethes with resentment about how much Obsidian knocked Fallout: New Vegas out of the park. Is there evidence for this? Nope—quite the opposite, actually—but it endures because it jibes with the worldview of certain Fallout fans who see Bethesda as perverting the series.