Shriners are a different group from Masons... related but not quite the same.
I hang around with a lot of masons/masonic-related groups, they're fine but the problem is that most of the adult masons are usually older people with the extra time on their hands... masonic activity is time consuming. So, figure old people + car = bad.
I just have problems with old people driving in general, whether they be masons or not.