One of my clients in my current work role is a Millwall STH and a lovely bloke without a racist bone in his body (and I think a puff of wind would blow him over). He certainly hates Palace though
The bloke he's partnered with on the project is a West Ham fan. It's a dynamic between the three of us that has resulted in a few interesting conversations
I too am ST holder at Millwall and I think most people who know me on here know. I am one of the least racist and most left wing PC that you are ever likely to find.
However I have to concede amongst some fans the reputation is warranted. Indeed when they approached Chris for the Managers job a few years ago I was glad he didn't go there because even though it's my Club and I'm a fan I would have hated it if he was racially abused if results weren't going well.