Todd assumes that,
since Dirk saw his future self in the past and gleaned a couple of
bits of information
that he (Dirk) either knew, or at least should have known, what was going to happen
(that they would essentially end up travelling back to the past
themselves and reliving the events).
He's possibly laying the blame for those who were hurt as a result of those events at Dirk's door, or at the very least he's angry that Dirk kept this knowledge from him - possibly he believes he could have done more to help the victims if he'd been forewarned.
However, I have to say in Dirk's defence, Todd is being very unfair here.
Todd himself also saw his future self in the past, wearing the coat
and t-shirt he later deliberately picked up. He also heard a snippet
of his future self's conversation with Dirk. So he basically had the
same amount of knowledge - seeing his future self, acquiring the items
his future self had, and hearing a piece of information out of
Todd revealed none of this information to Dirk, so if Dirk is a monster then Todd is just as guilty. Todd might argue that he was shocked by what he saw and it only made sense to him in retrospect - in fact this is pretty much Dirk's argument in response to his accusation.