Loosing with bad calls makes me feel more uncomfortable than loosing with good calls. When an opponent made a good call, that's fine, he played well and he deserved it. Although I still think we have to stay calm with loosing with bad beats. I remember that I played a tournament last week. When I have JJ against an opponent at big blinds, my image was very tight and the tour is on the bubble. He called and the board was 982. I make a CBet then he raised me. The pot was too high so I pushed all in. And he called me with A9 and won the pot when the river turned an A. After that loss, I just had about 5bb left. Fortunately, I manage to survive, got into the money, and finish 2nd. So just staying calm and never giving up are always keys to success.