You can, where it's accepted. I know it is not accepted everywhere yet, but you cannot deny that it is a currency that can also be used for purchases like normal. Some examples for you down below:
You can not name currency thing, that every merchant exchange to real currency as soon as possible when he get payed, Term "assets" is more accurate for Bitcoin
What does "real currency" mean? Which currencies are real and which are unreal? Does a country standing behind a currency makes it real, or maybe the use cases do? For instance, there's a country behind The Zimbabwean Dollar, but there are no use cases. The bills aren't even fit to be used as toilet paper.