The plaguefall route that people use to skip trash is very narrow and unforgiving if you step out of line a little bit you easily aggro a bunch of mobs. It's a common mistake people make so the best thing you can do is shrug it off and move on and get used to the pug mentality.
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Completely understandable but that is the nature of the game. Min Max mentality with no punishment for abuse leads to such an environment. The best thing you can do is to find like minded individuals to play the game with or play Russian roulette with the group finder.
If only we had GMs.