Business decisions tend to be very personal. The “it’s not personal, it’s just business” adage is largely baloney. It is personal and anyone who tells you otherwise is generally lying.
There is, however, strong reason for you to not take things personally. Decisions are not a result of objective truth simply because there is no objective truth when people are involved. And, more importantly, decisions are functions of the specific situation. Situations, in turn, are functions of the context, the motives and character of all the actors. In a decision that involves you, you are just one actor out of the many that might be involved. You don’t control their motives and character and definitely don’t control the context. So, taking it personally is just a recipe to ensuring you feel hurt whenever a decision that involves you does’t go your way.
So, any business decision that involves you is personal. There’s no getting away from that.
But, for your sanity, don’t take them personally. Reflect on what you were meant to learn from the situation and move onto the next thing.