Why do United fans seem to hate squad depth?

Year in and year out since Fergie retired it's felt as if a fair share of United fans have something against having more than 1 or 2 good players. It's either that or we love pitting them against each other.

Just over the last few weeks I can't count the amount of times I've come across variations of the following:

• “Rashford or Martial”
• "We should get rid of Shaw since Williams seems capable of doing a job"
• “Greenwood is playing well I don’t really know if we need Sancho”...

Why do United fans seem to hate squad depth?