Thanks fellas.
I'm pretty sure the agents US in MYR aren't cross utilized ramp workers, it's a sizable station for US. As always, I could be wrong. They probably just screwed up by not checking me in when I initially asked them for the jumpseat at 1:15 prior to departure and just wanted to scold me to make themselves feel better. Even though I fly freight, I have enough experience with gate agents to know the routine
In any case, it doesn't matter, I'll probably never go back to MYR. It was a one time thing.
Thanks again.