You can absolutely claim to care if you fail to show up and cast a blank ballot. This is such a ridiculous stance. All you have to be is a person that's more concerned about the end result more than anything.
You can either
1. Spend your time going to a polling place, wait in line, and literally cast no vote
Or
2. You can spend your time doing something productive or at the very least something you'd rather be doing and have the exact same vote be cast.
It's cool if you prefer going and casting a blank vote personally and advise others do so, but suggesting that it's a fact that the only reason a person doesn't vote is laziness is just silly.