I always take my bike in with me. Occasionally someone objects. I cease to be their customer.
To those who object, the conversation goes like this:
You can't bring your bike in here!
Why not?
It's not allowed!
Could you point me to the bike rack please?
There is no bike rack here.
I turn away into the store with my bike and begin shopping.
You have to take your bike outside!
If there is no place to lock my bike I am keeping it with me. Where are your batteries please?
Look, you have to remove the bike from the store! We cannot sell you anything until that happens.
Gee! What a great business you have! You are doing so well, you can turn paying customers away! Say, what other things can't paying customers bring into your store? Is there a list somewhere? Can I see it?
There's no list.
So you admit you just made up the rule that bicycles aren't allowed! Maybe it's racial discrimination!
I'm telling you, we do not allow bicycles in the store!
Could you make a list for me of all the things paying customers are not allowed to bring into your store so that I can be sure not to bring them with me inadvertently next time?
Get out of my store!
Basically I just make a scene and try to waste as much of the clerks time as can. It is fun to see how long I can make it last.