Sing, bang the drum, bounce around and support the team and it is unlikely you will get much bother. Let of smoke bombs then your asking for unwanted attention. They dont write the rules but need to apply them. I've been lifted previously at a match and looking back it was me acting the clown! (Shocker!!)
It ain't my cup of tea but the lads do bring much needed atmosphere to matches. Cut out the smoke bombs and such likes and you won't see too much bother at away matches!