Everything is relative as stated by the responses above. Target size, consistency, wind, cartridge...etc, all of these are ways of also defining these categories, but when it comes to straight yardage:
1) on a relatively square range
2) shooting prone in a relaxed environment
3) with a capable caliber (30-06 or under)
4) making calculated, consistent first round impacts
100 to 300 is everyone.
300 to 700 are the Beginners (boys)
700 to 1100 are the Experienced (men)
1100 to 1500 are the Experts
Here is my thought process of this:
100 to 300 can be done with Kentucky windage by a beginner. Most rifle hunters with no "long range" experience are doing this.
300 to 700 is the basic understanding of drop and beginning windage. This is the learning long range zone.
700 to 1000 has changing environmental effects with Density altitude and drops as well as wind zones (Horizontal and Vertical)
1000 to 1500+ is being awesome. Fully understanding day to day environmental effects on Drops and really good at reading wind. (maybe a touch of Luck)
To be in the Men or Expert level you must be able to do this at every shooting location, not just your home range that you always shoot on. You might be a in the 700 to 1100 category on your home range but in the 300 to 700 if you travel to someone else's range. Your lowest level if your level.
Added Men's categories to measure by.
Master of Firearm - I think Consistency is a big deal. 1"-100yd groups ALL the time, better yet, hit 1" dots at 100yd consistently.
Master or Environment - I think being able to change total environments and still make impacts is a big deal. Impacts on small targets at shorter ranges and impacts on sufficient targets at longer ranges. (Florida to Idaho for example)
Master of Terrain - I think being able to make difficult terrain shots is big. (Steep Up hill, Steep down hill, cross canyon)
Master of Knowledge - I think being able to do all of the above without a computer is the most impressive. (no Kestrel or apps, just paper)
Just my 2 cents.