Many pious people (i.e. Muslims, Jews, etc.) demand respect and acknowledgement for their religion. It would therefore be extremely hypocritical for those same people to deny respect to any other faith, including Pastafarianism.
Society is not needed to handle religious groups that are trying to mock it the same way as serious religions. The status to be a religion is a freedom that has a large impact as it brings benefits (eg. Tax exemption or limited prosecution). That is why requirements are set to ensure serious intent.
The 'practitioners' of the religion willfully attest to the fact that they do not actually believe in any of its theological principles. It was devised as a social movement. It should be 'respected' about as much as any other social movement.