I'm not sure how the law works - do shopowners give people the option of removing their hoodies (so they can just carry it with them)? If so, you might want to add something like this:
S: Hoodies are banned from our shop. You'll have to remove it, or else I'll have to ask you to please leave.
S: I am. The door is over there. (there / here? I am not that sure…) This sentence is fine ("there" is correct).
Possible revision for this sentence:
S: Well, one point is, that we don't tolerate intimidating behaviour and bad language in our shop. Also, for our own protection and that of our customers, our security cameras must be able to take a clear picture of you.
T: Of course. All of us are rude, bad-behaved teenagers, who steal everywhere we go. Why not just ban us all from the shops? Tell me, if you saw an old lady wearing a hood, would you ask her to leave the shop?
S: That's not the point. NOTE:Perhaps here, instead of the manager saying "That's not the point" he could be more assertive. "I'm not here to debate the rules, I am here to enforce them. If you don't comply with our policy, you are welcome to leave."