She's not complaining about being hit on. She's complaining about a bait-and-switch -- pretextually getting her number or other contact information in a business context, and using it later for personal contact.
Rejecting is not a direct complaint. She seems to understand that this indeed is just part of life. Yes, she doesn't want to be hit on. But that's a straightforward interaction she can deal with -- by rejecting it, as she says, and moving on.
The bulk of the post, the actual problem she's complaining about, is being hit on by "stealth", where she can't bluntly reject without compromising other interests, whatever the context is supposed to be on the surface.
EDIT: Whoever downvoted you is an asshole. Explaining the reasoning for your interpretation is a necessary part of this conversation.
She's saying that anyone who wouldn't hit on her, but still take her card and use it to get a date, are the types of guys she'd want to reject if they did suddenly decide to hit on her.
She's not complaining about being hit on. She's complaining about a bait-and-switch -- pretextually getting her number or other contact information in a business context, and using it later for personal contact.