Male tolerance serves as an excellent indicator of both attraction and emotional maturity. An emotionally mature man will not frequently react with anger without just cause.
In the context where you are not intentionally provoking him, yet you notice he becomes easily irritated by you over minor inconveniences, usually indicates that he does not harbour strong feelings for you. A man who is genuinely attracted to a woman will find it much harder to feel irritated or angered by her. Such irritation can be a revealing sign, especially when he is merely feigning affection.
Many women are aware of this but often choose to rationalise the man's behaviour in favour of deluding themselves to prolong an unrequited arrangement. He may like you - just not as much as you would like him to.