I don't get your point, but if you park your car in a public bus stop you're an asshole regardless of its value.

You seemed to imply in your original comment that taking the Google bus versus not taking the Google bus boils down to a class issue of "haves" and "have nots", so I was trying to illustrate that no matter what that class distinction would still exist.

I'm sorry, but no. Private busses using public bus stops — and blocking public bus traffic — is not an income issue.

Are the private busses in any way holding up public bus service? Is there a serious reported story somewhere establishing this?

SFMTA's most recent evaluation:

https://www.sfmta.com/sites/default/files/projects/2015/Eval...

TL;DR: Of an average of ~3000 "stop events" per day, 2.7%, or 80-ish, resulted in a shuttle blocking MUNI.

Shuttles were also seen to block travel and/or bike lanes in some 35% of their stops.