i understand his voice can be annoying at point but i do not understand why people would stop watching the entire anime over something that minute. I have a few friends irl that have stopped watching and just said the entire anime is trash over asta's voice.
Prejudice, self-conceitedness and plain old arrogance.
Yeah BC doesn't really bring anything new to the table and its usage of many Shonen Jump tropes is obvious, however that doesn't mean it isn't something that can't be enjoyed and that it doesn't have its own charm.
Ten years ago was a time where you had to watch a single DBZ-episode on three YT vids. Now you can download hundreds of episodes with a few clicks. The point is that the past decade the anime & manga industry has obtained a strong presence in popular culture and in particular on the internet. As a result this has also slowly changed how many people experience the series they watch/read.
Where originally people were just glad they found other people with similar interests and tried to perceive things as they where, now they group themselves in a way that can be compared to gangs and if something even slightly didn't appeal to them, the verdict by default becomes that it's trash. The art of nuance is something that's almost heretical to them.
Not only do you have fanbases of different series that are at each other's throats, within such a fanbase you have fanbases for specific characters that treat each other the same (or even worse) as they treat fanbases of other series. But what is a common occurrence in all of them, is that they like to pretend (subconsciously or not) that something has to be almost life-changing to be considered good and that their view, naturally, is the reference point.
There's also been a generational shift. Many of the most prominent series of the previous era have ended while new ones got serialized and it's in that kind of climate BC first appeared. Considering the attention it was given from the start and that it made use of traditional concepts, there were quite a lot of people who didn't really appreciate the newcomer. So they used whatever they could to criticize it. The whole
Aster-is-screaming thing was ludicrous from the start, but if you have enough people who repeat it endlessly like a mantra, it starts to affect the general perception.