When Paul says "I don't allow women to teach" why is this read as an instruction?

The famous verse 1 Timothy 2:12 is widely referenced in discussions regarding women church leaders: > I do not permit a woman to teach or to have authority over a man; she > must be silent. My specific question is when Paul says "I do ..." why is this seen as instructional to the global church by those who hold that view, rather than him recounting what _he_ does? Is Paul viewed as inerrant when he _does_ give instruction?