If you are arguing that bitcoin is a bad currency because of high transfer fees, very few merchants accept it and that very few people are actually buying things with it in any meaningful way, then that's wrong because it's an asset.
If you are arguing that as an asset it is purely speculative and has no fundamentals and zero return other than appreciation, then that's wrong because it's a store of value.
If you are arguing that as a store of value it's actually highly volatile and has experienced multiple serious crashes, then that's wrong because it's actually a currency.
This is the primary tactic Bitcoin seems to use to deploy to combat any criticism - if someone critiques its ability to do one thing you claim it's something else..
