I remember going to a rearranged Newcastle game up at St James Park in the 90s. Original game was postponed and the changed fixture was during the time they were rebuilding the Gallowgate end and refused entry to away fans. Couple of dozen Cov went up to challenge Newcastle as our tickets said valid for rearranged games. Most of the gang I went with got comps from the players. I missed out and had to buy a ticket from a tout (bartered him down from £30 to £15 for a £10 ticket). Have said I like to chat to other fans and this time, I ended up on my own in amongst the Newcastle fans. Had a great time even though we lost 4-0. Saw other Cov sprinkled around but they all had their heads down, trying to avoid attention.
If you go in and act up, locals won't like it. Behave and be sensible and most football fans are welcoming.