International buyers should NOT be discriminated against. But the buyer/seller should negotiate the right shipping method/payment at the very beginning. And stop being lazy. Filling out a customs form is not that big of a deal.
I get what you mean, but discrimination is not the right word here.
Customs forms aren't the only issue as you have seen in this thread.
You Could offer your services as a international shipping intermediary.. Should you, that's up to you.