If he actually embraced the philosophy (which as I recall, involved peaceful resolution of conflict and respect for all living things and their interrelation), I'd have some more respect for him. The fact that he's making such a big deal over this - as well as not respecting the custom of the shop-keeper - shows that he's completely missed the point.
Most religions (and I'll lump mine right in there too), viewed from the outside, could be classed as fiction. Heinlein never pushed the Church of All Worlds (from Stranger in a Strange Land) as a religion, and yet its followers (the ones I've met) have developed it into a viable philosophy.
Founder or not, this guy is just looking for an excuse to dress up.