You don't dismiss things in the world, you dismiss unhelpful patterns of thinking, and cultivate helpful patterns.
It can be more helpful to the world around you even if it is less helpful for yourself to not dismiss these patterns of thinking.
The trick is to recognize the things that are wrong, decide what (if any) course of action you can/will take to address them, then focus on that path. The rest you have to keep at arms' length. There are so many things wrong (and so many things that are so very, very wrong) that it should be overwhelming to a reasonable mind to try to "feel" them all.
The point is that dwelling on them will make you miserable AND does not make anyone else better of either.