A plurality of the people who voted went for Trump not a majority. He won 49.8% of the vote. When you include everyone who is eligible to vote he only got 31.8% of the total electorate. A large percentage of the electorate doesn't vote.

If you don't vote, you agree with the majority. Plain and simple! If you want to show your protest, go vote and explicitly vote with an invalid ballot or a third party. Don't give yourself the convenient "out" of staying home and then feeling like you're such a counterculture warrior for doing it.