Being grounded in intention doesn’t mean you don’t feel irritation or let this individual belittle you, it only means you do not get lost in judgment or get stuck in a reactive mind. You remain impartial and are able to recognize that his actions have nothing to do with you. You can then actually begin to experience a sense of compassion for what he may have gone through in his day. You are then free to sit back and choose your response.
Whatever is manifesting itself in your life right now is affected by how you receive it, and how you receive it is largely determined by your intention in this moment. Setting your intention is simply aligning yourself with who you truly are and surrendering to the reality that often we get lost in our wanting mind.