I think its mainly how they carry themselves on the hill. A true skier, park rat, or touring enthusiast is going to treat others with respect, especially the mountain. As gay as that sounds theres something to be said about a true/die hard skier, and that common ground of simplicity we share. Another tall tale sign is,
-how they hold their skis
-If they know how to get thru a lift line (every other/utilize the singles line)
- Overall positivity, they love skiing, doesnt matter weather or conditions
- If they WAX AND TUNE THEIR OWN SKIS!!!!!
-And lastly, how they ski. Is it hard charging, forward in their boots? or laid back, seemingly bored.