Lots of waffle here prof.
First let me say that for more than 20 years I usually attended 2 soccer matches a week as part of my work. So I do know a bit about it.
Here is a specific description between the difference Rugby (and any other sport) and Soccer.....I say soccer cos it clearly winds you up.
There is probably no much more emotive atmosphere at any rugby match than that which exists between Bath and Gloucester (the most rabid rugby town in the UK). Buy a Bath shirt and go to Gloucester for a match you will be welcome in any part of the ground even “The Shed” the standing only area where the most vociferous fans are to be found. You will be in no danger, after the match walk down the street proudly in your Bath shirt, again no danger. Go into Teagues Bar opposite the ground which will be crammed full of Glos Boys in their cherry and white shirts you will probably be one of the very few in blue, black and white, again you will be totally safe and I am prepared to bet money that several of the Glos Boys will buy you a pint especially if Bath have lost.
Then go to watch, say, Birmingham City vs Chelsea wearing a Chelsea shirt. You will only be allowed in the away end and wont get a chance to talk to any BCFC supporters. After the match walk through Birmingham in your Chelsea shirt or go into any of the local pubs and see how long you last.