For like 99% of people arguing that 'voting is useless' they are also not working towards any other method of improving society. Either by working towards unions, or effective means of protest or even violent revolution. They're just opting out and doing nothing of value while feeling smug about being 'above' such petty squabbles.
If you are the 1% actually doing something of value that isn't voting. Congrats, I guess? But I think I'm far more likely to convince someone to vote, which is at least somewhat helpful than I am to convince them to join a revolution.