I disagree. The margins seem thin enough that people fed up with either party can absolutely ruin them in the swing states. If you were to disagree with one of the parties, you could absolutely give them a signal by not voting. Preferably such a person would also make very clear why they refuse to vote for a party, because otherwise it’s indeed just lazy and empty.

Again, I think that people who do so are shooting themselves (and everyone else) in the foot. But I can see their motivation.