Democracy and free speech do not come with a condition like that. It never has.
I have every single right to complain about whoever is doing a shitty job managing the affairs of my city/province/country or any other country, for that matter, regardless of whether or not I had voted in the elections.
Yes, I vote. EVERY election I am entitled to. Municipal, provincial and federal. I'm Canadian, I don't vote in the US elections and I am still entitled to complain about whatever administration-dependent ass monkeys are in the White House. Any time. Any term.
Whether they are elected fairly, elected unfairly or the title passed to them when their reigning parent died, however the leader of a sovereign state gets there, they are in the shooting gallery lineup with the rest of the ducks and EVERYONE who voted and didn't, alike, can have a turn at them just the same.