yes fine by me :)
Seriously though, try fiddling it around with a screwdriver. It may have become dislodged somehow and jammed. Its not going to be the end of the world even if it breaks off and goes into the tank. It'll just sit harmlessly at the bottom. It's something the car will quite...
That should just rotate out of the way against a spring, as you push the nozzle in. Have you tried being a bit 'firm' with it? probably just seized up.