While I agree that Colin could have been a little more civil about it, Mirna should have just stood their until he was done. I rewatched it last night and it was very clear that Mirna jumped in right in mid sentance and started talking.Many many men have told their slower female partner to move faster, and very often in much less kinder terms. Mirna does have to be a bit aggressive, because she has to be the "stronger" partner in many ways that are usually filled by men. I thought Colin was far more in the wrong to snap at Mirna, than she was for "interrupting."
Mirna has to be the stronger partner but clearly isn't. Charla carried the beef, Charla has done 2 of the 3 roadblocks so far. Yes she at times is very encouraging to Charla but there was a time during the caviar roadblock that she clearly was getting up set. I believe she said something to the effect of "Charla hurry up and eat the damn thing."
Charla would be better off with someone who is willing to take some of the tasks and do them as well.
Now maybe Charla wants to do all the non-running/non-physical tasks because she know that Mirna will have to step up and do those.
My wife watches the show with me but isn't a huge fan, the other night she said, "I am not liking that Mirna, she is kind of a snot isn't she." This was just out of the blue and we weren't even watching TAR.