He kinda threatened to kill the guy the bachelorette was most interested in.  Then later he came back on the spinoff series and immediately got himself blackout drunk and started trashtalking and behaving threateningly, whereupon they kicked him out.  The viewers generally seem to consider him to be awesome to watch but unlikely to be pleasant to hang around with (or marry). None of this implies that she isn't an idiot, but anyway she did have her reasons for skipping this one.