There are quite a few Boxsters in SoCal, I wouldn't take it personally if they didn't acknowledge back. I definitely wave on twisty roads tho, you know it's an enthusiast up there (it's even moreso when your riding a bike and wave to other bikers).
This car was regarded as a 'trophy wife car' by my friends when I first considered it, but I ignored them because it's such an amazing car overall. Sadly tho, most of the people I see driving them around my area seem to fall into that category
-David N.