It's human nature to be inconsistent and hypocritical. We regularly ignore our own bad behaviour and emphasise others as part of an ongoing campaign to either make ourselves look superior to others, justify behaviour we KNOW is inappropriate and thereby ignore it, or just to feel better about ourselves. Most people aren't even aware that they're doing it and, if they are, then it's something totally different, of course. It's different because THEY'RE the ones doing it, which somehow makes all the difference. For example, you might say that someone is arrogant, but say that you're just extremely confident in yourself. It's all a game of semantics, and we're very, VERY good at subconsciously applying positive terms to our actions and negative terms to other people's.
Yeah, sometimes it's annoying...most of the time, actually. But if you're honest with yourself, you'll see it in yourself as well, and if you're REALLY honest about it, you'll realise that it's just as bad. It might not be exactly the same thing that they do, but there's always something, and hyocrisy is hypocrisy, it doesn't come in variants of how tolerable it is outside of individual tolerance, which is subjective opinion.
Personally, I have no problems admitting I'm often a hypocrite. I look down on others who look down on others. I complain about how my mother often complains. I tell people they can't expect everything to please them, and they I get annoyed when something doesn't please me. I don't even realise I'm doing it unless I stop to think about it and, when I DO stop to think about it, I'm not particularly remorseful. The "everyone does it" excuse doesn't justify it by any means, but in a way it does, because it's to be expected: I'm human, just like everyone else.
Anyone who tells you they are in no way a hypocrite at some point or another is either a liar or lives in a rosy pink bubble and has no concept of their own behaviour. It takes too much time to point out other people's inconsistencies, and the very act is hypocritical, because EVERYONE is inconsistent. Live and let live, I say. People are going to do what they want to do and think what they want to think; nothing you say or do is going to change that. If someone's behaviour bothers you THAT much...well, you don't HAVE to interact with them. Problem solved.