We travelled up from London to Birmingham on a Virgin train last night. We have been to function and had a few drinks. The train manger came through the train and I enquired when the coffee was being served, he said he was under staffed and if we wanted coffee we would have to go down the the kitchen and help ourselves. I went down to the kitchen but noticed on my way other coaches had been service. I went back and complained to the Train Manager who said be causes I was a standard class upgrade I did qualify for coffee. I pointed out that I was a full paying first class passenger and told him I found his response not acceptable. Another passenger intervened on his behalf and I told him to mind his own business. My wife then called me back to the seat. Half an hour later we pulled into Coventry and were removed off the train by the Transport police who said they had a complaint that I been complaining to loudly and I would not allowed back on the train. I said I did not realise it was an offence to complain. They took our dealer and told us they would take a statement from the train manger and the passenger and come to see us today to take statement of the events from us.