The Brexit vote, and the apparent remorse by some of the voters, has made this very clear.
I may disagree with who you decide to vote for, but you absolutely have the right to vote for whomever you think best represents you. But "ooh, I thought this was just a protest vote" doesn't count as a reason. This remorse is pissing me off. People who had no clue about how serious a decision this was (and I must admit, I don't know enough to have a view on whether it will be good or bad in the long run) - voting, and then wishing they had voted otherwise. If I were going to vote on something of this magnitude, I would have damn sure done some research first.
Take your vote seriously. In many places, you wouldn't even have a chance to vote - or would be killed if you didn't vote for a specific candidate. In other places, if you're a woman, you can't vote. People have died (and continue to die) for their right to vote. This is not a game. Please don't treat it as if it were.