The problem is that every tendency has its exception
and most, if not all, of the exceptions are quite widespread.
Being widespread would make them the tendencies, not the exceptions.
If you think “hardcore” runners spend less money, you can always find quite a few “hardcore” runners who spend more and a lot of not so “hardcore” runners who spend next to nothing. If you think “hardcore” runners spend more time running, you can always find some not so “hardcore” runners who spend a lot of time running.
I do not associate long hair and wearing dresses with men, though there are plenty of men who have long hair and/or wear dresses. There is nothing wrong with any of that, but most men do not wear dresses.
If you think “hardcore” runners don't take as many days off, I'd have to ask whether you think people who do those decades long streaks are “hardcore” (I think they may be in some way but I also think “hardcore” runners know when a day off is needed and aren't afraid of taking the day off).
Hardcore runners focus on performance, not on running or training simply for its own sake.
I can list a bunch of general tendencies (such as below) but there are always plenty of exceptions because I truly believe a hardcore runner can come in many forms.
Who said that rules or tendencies cannot have exceptions? This is not some rigid court ruling that will bind people narrowly.
A hardcore runner may be the person you see always running, seemingly at all times of the day and definitely in nearly all weather conditions.
A hardcore runner may be the person you see at the local high school track all alone but still doing gut busting workouts.
A hardcore runner may be the person you see at the biggest hill in the area charging up leg and lung searing repeats whether or not anyone is there to see them.
A hardcore runner may be the person who runs through fatigue, soreness, even pain when the time is right but also knows what not to run through.
A hardcore runner may be the person who does not make excuses for missing a run.
A hardcore runner may be the person you see out running at 10:00 at night because they couldn't get the run in earlier in the day.
A hardcore runner may be the person you see out running at 3:00 in the morning because they know they won't have time later in the day to do the run.
A hardcore runner may be the person who always brings all he or she has to every race and lays it all on the line, no matter what shape he or she is in.
I knew you had it in you! ;D