The Tory majority was delivered against a manifesto which May will not deliver on, and the Leave vote was just as slender and was delivered against lies and fictional delusion. Both need to be opposed, that is a vital part of democracy. Shutting down discussion due to a vote is tyranny.
Democracy is a system of avoiding the arbitrary rule of despotic ideas. It is not an infallible system and needs to be questioned in both these cases.
Teresa May was not elected. Brexit means nothing.