I honestly don't know if this is because I'm dumb or I'm smart, or maybe the work context I developed in, but personally interruptions don't really screw up my flow much. The only time it really causes me to lose focus is if the interruption has a high emotional reaction.

I don't like interrupting others but at some point I wonder if some just don't do anything if they're not in "flow". I think it's important to be able to make progress when you're not in a flow state. Its a skill.