You might have had a better case if you weren't trying to argue about your 'rights as a customer', which simply don't exist under the circumstances you seem to have described!
You've told us the flooring was 'in perfect condition' and I assume that it wasn't 'wrongly described' in any way. (Further, I assume that the purchase was made in the shop and not on the internet, so the Distance Selling Regulations won't apply). In which case I can't see that you have any right to either a refund or exchange. Once a sale of goods is completed there is NEVER any right to either a refund or exchange unless:
(a) there's a legal 'cooling off' period, as with distance selling; or
(b) the goods are faulty; or
(c) the goods were wrongly described ; or
(d) the trader has voluntarily chosen to enter into a contract to refund or exchange goods which the purchaser later decides that they don't want. (e.g. the 30-day money-back guarantee offered on most goods by Argos).
So you appear to have been ranting about 'rights' which you never had anyway, so it's unsurprising that the trader would want you to leave their shop.
Section 5 of the Public Order Act 1986 states:
"A person is guilty of an offence if he . . . uses threatening or abusive words or behaviour, or disorderly behaviour . . . within the hearing or sight of a person likely to be caused harassment, alarm or distress thereby"
The relevant defences are cited thus:
"It is a defence for the accused to prove . . that he had no reason to believe that there was any person within hearing or sight who was likely to be caused harassment, alarm or distress, or . . .that his conduct was reasonable."
(See here for the full wording
http://www.legislation.gov.uk/ukpga/1986/64
but note that there's a change to the legislation which I've incorporated into my quote above but doesn't yet appear on the page from which it was derived:
http://www.bbc.co.uk/news/uk-politics-21020737 )
If you'd had a
legitimate complaint against the trader then the 'reasonable conduct' defence might, at least in part, have been useful to you. However, since you had no such complaint, you'll need to rely upon showing that your actions were not likely to have caused 'harassment, alarm or distress'. When assessing such a likelihood (or the lack of it) a court will take into account the particular circumstances of the action. (For example, a court has ruled that it's not illegal to tell a police officer to 'F off' since, by the nature of his job, he's unlikely to be caused any real 'harassment, alarm or distress' because of it. However telling a group of nuns, who are accompanied by young children, to 'F off' is far more likely to fall foul of the law). So a court would have to examine whether you could reasonably have expected the people in the shop to suffer 'harassment, alarm or distress'.
When you were at the police station you should have been asked if you wanted the duty solicitor (or a solicitor of your own choosing) to attend. You've not mentioned a solicitor, so I assume that you declined that offer which, in my opinion, was a very big mistake! You certainly need to obtain the services of a solicitor a.s.a.p. and to get them to examine the statements from all concerned (and to seek out the CCTV evidence, if such exists).