This isn't discrimination. If your card's been rejected you'll have to ask the bank why it didn't work they'll explain why it didn't work. Some web hosting & domain seller companies accept bitcoin so it's good you've got the domain.
OP seems to think the website is racist. (?) I do not know how true that will be. Like you said there could be just some issues with your card or it's just not compatible with the site. You would need to check again but either way, this highlights how in times like this bitcoin really is the best option to pay online for less hassle.