Just playing devils advocate here
There are certain norms in society and its subcultures. Cycling has its own way of doing things and I would contend that bringing a bicycle into a shop is one of them. No, I didn't obtain permission, but I didn't ask the owner if I could enter his shop. "But that's the point of a shop!" you say. Ok, fine.
How dare I be so audacious to bring my fanny pack (YES, a FANNY pack) into the shop, didn't ask, did I? What about shoes. Did he have a sign that says "Shoes be cool?" Nope, he didn't. House keys? Nope. Watch? No siree. Bandaid on my elbow? ditto. There are none of those things of mine that I asked if it was ok to bring onto their private property. So either you're accepting that there are certain accepted norms or you'd be going into every shop naked unless you ask first and even then, you'd probably better be safe and ask first if you can enter. But don't knock or ring a bell to get them to answer the door, they didn't give permission for you to touch it (and I've never seen a doorbell that said, "Hey, you can ring this without asking." However you first have to deal with crossing that parking lot, which is indeed private property.
So, in the cycling world, the norm and accepted ways are to be able to bring it into the shop. Hundreds of shops I've been in and only one had a problem with my bike being inside and I suspect the experience of others on this forum is similar. Sounds like an accepted practice in the cycling subculture.
So given that we're all into respecting private property, what gives him the right to touch my property? If he wanted me to leave, he should have told me to do so (not ask, ask I could then tell him to get stuffed).
So there you go Beelzebub. If they had a Angel emoticon...I'd use it.
P.S. post-edit but WTF, just noticed the word n-a-k-e-d gets a star. You Brits really need to stop using underwear that is too sizes too small.
*'ing out 'naked' UnF***ing believable.