Had the opportunity arisen, would you have voted for her simply because she was already in post or would you have chosen someone else?
If not, you consented to abide by the rules of the game, not to May leading the country.
As a complete aside, she's a wonderful example of how far systems can stretch right to govern away from the Clapham Omnibus definition of democracy. She gained the PM position with just 166 direct votes, those of the Conservative MPs who supported her in the second ballot of the party leadership contest. None of the other UK voters got a say in whether she could lead the country because that's not the way we do things here and the rules are quite clear.
At least Boris stood in the popularity-by-proxy contest of a general election.