Political Memes

When it comes to voting, yes.

Actually no. Especially not if one were to actually ascribe to your line of thinking. The point of voting for democrats is to slowly move US electoral politics to the left.
It has been shown, time and again, that the democratic party only moves further right, no matter if they win or lose.
If one believes in electorialism as a vector of promoting leftist politics in the us through slow, incremental, change, then it is clear that one ought to vote for a leftist third party. This would of course not have immediate results, but that is, by your line of reasoning, not something that is achievable anyway. What is achievable, through your reasoning is a long term change. Long term change would most effectively be done by creating a viable third party. The only way to do so is to vote for a third party.
If you are arguing that the issues are more urgent and not something that can be dealt with over a longer period, then we must also dismiss the argument that the democrats are in any way a viable party, since the argument of voting for them likewise rests on this idea of long term electoral change.

Oh, you think by voting that means you cannot do anything else?

Not at all, but that seems to be what you think, since your immediate reaction to being told that voting for democrats is, at best, pointless, is to say "oh, so we should just do nothing?"