I believe you’re a Manchester United fan and if truly Manchester United supporters are saying this then they are a confused set of fans because last season and at the beginning of this season they were praising Garnacho rating him as the next big thing to break out of Manchester United so I’m surprised that the season is barely over and they hate him already lol.
I was surprised to see Manchester United heave so much praise on Garnacho. When you watch him you know that he has a lot of potential, but it was obvious he's not a world beater. He's not going to be one of those players who are among the best in his position. He just had the potential to be a good player. What made it worse is that he didn't improve.
United fans are indeed confused; they get excited by every little shiny toy. They said the same thing about Mainoo and how he's the best young midfielder, today, most of them want him sold. This has been their problem for a while now.
You'd be surprised to know that the people who run the club are also like that. That's why you see them signing players that just shone in their previous clubs without analysing to see if the player is actually good. They signed Mount, Zirkzee, Højlund, Ugarte because of this, and we can all see how things turned out.