Man I know what you mean. I haven't run into many unforgiving party members yet thankfully, but it's really a mood killer when you do get them. It's always easier to feel at ease when the party talks a little bit.

I always try to be super nice to everyone so if they mess up, like a healer who was off beat and had the entire party die, i try to tell them it's okay! Because that kind of thing happens to everyone and there's no reason to get angry about a game we're all doing our best, you know.

For every unruly player i'm sure there's another kind player out there.