Why the hatred for 1911s?
Several reasons.
A big part of it is the fanboys who have vastly overstated both the 1911 and 45 ACP cartridge. Many people have gotten sick of hearing the hyperbole taken for gospel truth. Jeff Cooper is responsible for most of this. He was probably the most prolific writer giving the 1911 praise. A large part of it fictional.
The truth is that the 1911 was a very good pistol for its time and was probably the best pistol fielded in WW-1. But by WW-2 it was already dated. Most of the troops who used it during WW-2 didn't particularly like the pistol nor the 45 cartridge. Almost all felt the Browning in 9mm was the better pistol. The army did too.
After the war the army did a lot of side by side testing and wanted to ditch both the 1911 and 45 ACP in 1946 for some new type of 9mm pistol. But due to budget cuts, no war, and warehouses full of functional 1911's the idea was scrapped until 1985 when the Beretta was adopted.
Most of the 1911 mystique came AFTER WW-2 due to the writings of Cooper and others. And from the 1960's until around 2000 1911's EARNED their reputation for being less reliable. Many were worn out military pistols or new guns made during a time of poor QC. This was a huge reason why revolvers stayed in cops holsters. The only real option for a semi was 1911's and revolvers were always considered MUCH more reliable. During the 60's, 70's, 80's and into the 90's there was a huge gunsmithing industry working to modify factory 1911's to get them to function reliably and shoot straight. You just didn't take a 1911 out of the box and shoot it without having it worked on.
To be fair many of the 1911's manufactured in the last 20 years or so have been much better. I've owned at least a dozen over the years and wouldn't trust most of them for carry. Accuracy varied from better than average to awful. I currently own 4 and they have been trouble free and very accurate.
The 1911 over the years has morphed into one of the best target pistol designs, particularly suited for many of the shooting games. Some of which were specifically designed around the 1911. But even if 100% reliable there are much better options for a combat or SD pistol in 2020 than a 115 year old design.