How do you feel supporting a club with a a sizeable fan base that is avowedly Nazi?
I went to a League Cup game at Brisbane Road in 1981, with a hippy Chelsea fan as it goes. I was supporting Orient obviously, him his team, equally obviously. We'd agreed to find the least conflictive possible part of the ground. There was a special offer, seats in the main stand (when that was still a big deal as we all stood) and a free programme for 50p more than on the terraces. Perfect we thought. We were right by the bar too, had a pint, took another to our seats. all around us were old fellas, given their age and our age (I was 19-20) and the year, they must have fought in the war or had younger brothers or sons who did. It seemed ideal.
So anyway, first bad foul of the game was the O's black left back arriving late and hacking down the white Chelsea winger. To a man (seriously), all around us rose from their seats and started zieg heiling, before cracking on with "White team in London, the only white team in London" (as you were then). Then we were treated to a series of amusing National Front songs, all in the worst possible taste.
My mate was devastated, I was sickened, we sat in silence before he turned to me just before half time and said "Shall we go?" To this day its the only game I've ever walked out of before 90 mins.
This wasn't a "bit of a laugh", "winding up the Yids" or whatever excuse you could possibly find (it being Orient after all). A second's look at the twisted faces of the straight arm saluting old men around us confirmed without a shadow of a doubt that it was naked, in-our-faces fascism, and I don't use that word lightly.