I assume you're in a very solidly blue or red state; otherwise "not voting for Kamala" is disagreeing.

But so is discouraging people in those states from voting, and you pretty clearly seem to be doing that, or at least not giving the "go vote for her anyway because the alternative is worse" spiel.

So, in practice, you are kind of disagreeing. You're effectively supporting Trump, given the how voting works in the U.S.. Now, this isn't to say that the system isn't stupid. But shooting oneself in the foot is not a path to the solution. It just leaves you with a bloody foot.