Projection

Is there truth to the statement by psychologist Carl Jung, among many other quotes like it: "everything that irritates us about others, can lead us to an understanding of ourselves?"?

Whenever we feel annoyed or angry at how a friend, or family member, or next-door neighbour, or TV character, or celebrity, or stranger on Twitter acts are we really just annoyed or angry that they are displaying traits that we have that we do not like about ourselves? 

And then is the same true for good traits? Are we drawn towards people who display qualities that we value in ourselves (but maybe feel repulsed by them when they show bad traits)?

I'm not sure if it's possible to prove but there seems to be a lot of research suggesting it's true. 

Here's an article I just read about it - not scholarly research, just a blog post, but one that seems to be a well-researched and well-presented piece of writing, one that resonates with me and some of my life experiences: What Annoys You and What You Hate About Others is Your Own Reflection (2018) - Kolaynne Russ - medium.com

Can I remind myself of this phenomenon and stop myself from judging every time I'm inclined to criticize or get angry or blame or point out flaws in others? 

Is the answer just to turn the attention back on myself and try to love myself, excuse myself, rationalize the flaws I have, and in doing so I'll have more compassion and understanding for others then too?