holding a grudge might be a bad choice of words...
maybe getting frustrated, or being disgusted with a fighter might be better.
I have no expectations of any venue other then the UFC at this point. I consider all the other venues up and coming fighters, and little more then amateurs or has beens. So i expect mistakes when I watch those venues. I expect alot of mistakes. and It does not bother me. I get to see fighters either grow and move up in venues, or get to be disheartened with past hopefulls who at some point stopped learning, or have been injury plagued, or grown soft and cant give it up.
when it comes to the UFC though I do not have the same forgiveness. I expect the best fighters in the world. I expect fighters to not make rookie mistakes, or continuously make the same mistakes. I expect them to grow after each and every fight, improve, show new skillsets in each new fight, and close holes in their previous games.
I also expect at that level for the fighter and his corner to be able to alter their strategy on the fly and adjust to poor results to their existing strategy. Certain trainers are good and certain ones suck at this.