Remember my first match mid 90's vs Palace at SJP where my parents bought me tickets for my birthday, it was a treat and couldn't afford it often. Unfortunately it was ruined by a babbling racist ion his 50's who my Mam kindly asked to tone it down to which she got a mouthful - obviously my Dad kicked off resulting in a scuffle. Me being 8ish I was shit scared. Makes me watch my mouth (swear words only) at matches to this day.
More recently, West Ham away in 07/08 season I think, outside a pub was a horrible atmosphere. Birmingham on my first visit, 2002 the 'Town full of pakis' chant got aired. Villa away when we got relegated was definitely worst I've experience with 'fans' giving racist abuse to any passer by from the buses, the bus I noticed later had a gollywog at the front, felt uncomfortable all the way home.
Luckily, not much else, other then drivel of some idiot nearby making sly comments about Shola or any other black player they can remember the name of. Always find pre-match bars much worse than in the actual ground.