Like said before, Celtic fans are only acting this way because they were delusional enough to think they were a superior side after beating Barcelona. After they got embarrassed the best way for themselves to react to their loss is by saying we cheated given what's happened in the past. It gives them an excuse and a way to make themselves feel better and reflect the blame. A cop out no doubt.
Anyways, we're surely off to the quarters and they'll be staying in Glasgow.
Maybe next time.