Now, all you guys who say "Hey, one guy by himself will never make a difference," or "I just walk past the sign and ignore it," or "It's their right to put up the signs that say they don't want people like me as a customer" - I've got a homework assignment for you.
Ask to see the owner or manager. Ask them why they don't want you as a customer. Then point to the sign, and explain that all it does is keep people like yourself, who have proven that you are not a criminal, from patronizing the establishment. While at the same time, criminals will walk right past it, or even target the business or shoppers because of it.
We've got 60,000 people who are members here. If just a few of you make a difference, that IS a difference. And it all adds up.