Celtic and their fans. Great atmosphere for Europe but I cant stand the sight of Tri-colours at Celtic Park bacause they have Irish connections. Get over it. You dont see Vasco Da Gama of Brazil or Newll's Old Boys in Argentina hanging up English flags.
Being "over Irish" (if that makes sense) eg I play football over in America and one of my team mates instantly raises his voice in conversation whenever we enter a shop etc so people can hear he has an accent. Drives me crazy.
Peas - I just dont rate them