Feeling frustrated by colleagues' behavior, considering leaving the university
My adviser told me in my first meeting with him: "I warn you that we'll agree on meetings, and I will just forget to come." This isn't ideal, but I took it as a cute forgetful scientist comment, not an insulting admission. And yes, it turned out to happen a lot. 

Professors deal not just with research and supervising students, but they might be involved with industry, probably have a family, and certainly spend much time fighting administration; and the more accomplished they are, the more time is spent dealing with issues they'd rather not instead of focusing on what most like (such as doing research, and supervising). I fully understand that your experiences are frustrating, but they don't strike me necessarily as that unusual. If you find yourself with an adviser who is always extremely reliable, you are lucky. You are not lucky, but this is still to say that all I think you need is patience. 

There is more to it though. If your adviser is the busy type, and offers a meeting right after sending you information, he obviously doesn't expect you to have it digested already. You should have taken him up on the offer, and refrain from fatalistic attitudes such as calling re-scheduling attempts a "mockery." Marcus Aurelius wrote (from memory) "We cannot change what happens to us, but we can change how we feel about it." While this isn't so easy, it's good advice as attaching negative feelings to events in the course of work or study doesn't help. From your questions here, you appear to do that commonly. I think your mind and body would benefit if you wouldn't. To learn this, maybe talking to a counsellor might help, if only to verbalize your frustration with them, and maybe so get it out of your system. 

I can't help but feel that the world around you isn't quite as dark as it appears to you. Try to learn how to perceive it that way.