Am I wrong to feel offended by...

Am I wrong in feeling offended that a task I've been performing for over a year has now been assigned to someone else, with someone other than myself supervising them?

Said supervisor hasn't consulted me and has disregarded my documentation / process.

Feels like a massive FU to me.

My work colleague tells me not to take it personally.

I'm growing tired of people spouting things like...

"Don't take it personally", "You're not the only one this affects", "I don't understand your problem", etc.

Management at work do my head in.