We cannot say something is true because we experienced it. Rather, we should say we know something is true because we find it in Scripture, which verifies our experience.
The word blasphemy speaks of a conscious denouncing and rejection of God. It is a defiant irreverence, a uniquely terrible sin of intentionally and openly speaking evil against God.
Maybe the problem in our society is not that we fail to love ourselves but that we love ourselves too much. We already do love ourselves. That’s obvious. It’s an established fact. Therefore, the Bible is telling us to love our neighbors in the same way that we love ourselves.