Or another possibility.. you're not God.
If the concept of enlightenment by the Holy Spirit being necessary for understanding Scripture is being mocked, the person is mocking the source of that statement.
Either God inspired Scripture or He did not. If He did, He is being mocked.
If the Catholic church gave us Scripture, then it is being mocked for making that statement.
It’s a lose/lose situation for a Catholic to be in. They can’t not offend someone and put their soul in jeopardy.