Was i wrong to ask something like this ?

so i was looking after my brothers shop while he was away in hospital, he told me to not allow anyone to wear hats or anything that could cover someones face from the CCTV cameras (because the area the store is in is very rough with a high crime rate), a few people came in and i politely asked them to remove the hats and motorbike helmets, they did so without any problems, then a muslim woman walks in with one of these things that completely covered her head with just a small opening for her eyes, i again politely informed her that she couldn't wear that in the shop, and the biker that walked in earlier that i was serving explained why, the woman then says its part of her religion, so i said (these are my exact words) "im sorry but in this shop i cant allow anyone to cover their heads, its purely for security reasons, there is a shop just down the street that wont ask you to remove the cover" i then gave her directions, and she went on her way to the shop........ about 1 hour later she decided to come back with a police officer, and said how i wouldn't let her in the shop, and the officer said "if you don't let this lady into the shop, im taking it down as racism", im a rather large guy about 6 foot 7 inches tall and am told by friends i look intimidating, so anyway i said in a rather angry voice, "im not allowing ANYONE in this shop if they have ANYTHING covering there head, on this i WILL NOT bend no matter what is required by ANYONES religeon" the officer then said "if you keep trying to use your size to intimidate a police officer i will be arresting you", while i was saying what i was saying, i didnt move i didnt get close up to his face i stould behind the check out and didnt even try to get in his face, in the end i didnt give in and didnt allow the woman to enter the shop and am now being charged with racism, the biker was on my side and when they both left the shop he just said "oh my dear lord, what has the world come to, good on you, you shouldnt have budged on your rules"