system
Given the following post, respond as if you're commenting on Reddit:
human
There is no point in voting because one vote never makes a difference. CMV.

Whenever I say this, 100% of the time I get the following response: 

"Yes but if everybody behaved like you, no one would vote, and then one vote WOULD make a difference".

My answer to this alternates depending my my mood:

"So?"
"But will everyone do that?"
"Thanks for the compliment that everybody in society follows my lead and won't vote if I don't. The problem is that I can't see it"

Please consider the above responses before making this argument.

Also consider the relevance of: you are more likely to get run over on the way to the polling station than your vote to make a difference.

Thanks!
gpt
You seem to have the assumption that your vote only matters if it changes which candidate wins election.  However, politicians look at vote totals to decide what positions to support/oppose.  So every vote - even for a 3rd party- influences future political moves for years to come.