Greetings all, Hoping to get your thoughts on something that occurred to me last week. We have a runup area next to the start of the runway at my non-towered airport. I was parked in the corner furthest away from the runway off to the side, engine stopped, troubleshooting a mechanical issue. An airplane pulled up ahead of me and did a 90 degree turn which put them directly in front. They were likely around 30 ft ahead (basically as close as you can get to turn without worrying about a wingtip striking my airplane. They then proceeded to do a run-up with their prop-blast pointed directly at me. My airplane obviously shook for the duration of their run-up, and I closed my canopy due to the dust/dirt/debris getting blown at my airplane. Being at high altitude, they did a full-power lean before the run-up which meant more prop blast than normal. I haven't encountered this before and there is nothing in the FAR/AIM about this, but it seemed like a very impolite move on the pilot ahead of me. There was no immediate safety concern as our airplanes were similar size, but it just seemed like poor etiquette. I'll be out this week and don't know that pilot real well but know where their hangar is. I was thinking about stopping by just for a friendly chat to mention this, but I don't want to come across as 'looking for trouble' or confrontational. Not trying to get anyone in trouble, just trying to learn and get better. Is this something reasonable to discuss in a polite and not-at-all angry way? Thanks for your input.