Our record against Rangers is poor, that's fair to say. Though its telling that we discount cup games and the play offs because it doesn't suit the story.
Our record at Celtic Park is probably a lot better than our peers and on average if we count them (the old firm) as one we're probably bang average againsy them amongst other teams at our level.
We used to beat rangers all the time in the 90s despite having less success (more top 3 finishes, more cup finals etc. Obviously barring one major success). Its
It's just a quirk of statistics, not some deep seated fear of going to ibrox, but that's not fun to get raging about.