From what I've seen:
Don't date a colleague.
Don't date anyone much younger/older.
Don't date a friend's ex.
Don't date an ex's friend.
Don't date a family friend.
Don't date a man who doesn't drive.
Don't date a man with kids.
Don't date a man with XYZ criteria.
Obviously every circumstance is different however people seem to close themselves off to many potential partners because of arbitrary rules.
So it's either meet someone online or through a club basically?
People suggest these magical clubs like they're swarming with single and interested suitors you just happen to connect with.