Had just got back from mission where Arthur gets kidnapped by O'Driscolls and Dutch starts saying he thinks Arthur's gonna betray him in the end. Then, immediately after that Grimshaw comes up and starts giving Arthur shit about not contributing to the camp recently.
I mean, even leaving aside the fact that by this stage he'd given more than $2000 to the camp, upgraded everything possible and the camp still had a cheeky $300 with nothing to spend it on, he'd only just got back from being kidnapped, beaten and shot!
And Dutch does nothing to try and rescue Arthur and then accuses him of disloyalty?
Man, their timing SUCKS.