The problem with twitter is its very easy to hide your identity amd get away with it without any form of moderation. No doubt these people have faceless profile pics and have probably never set foot inside the Etihad in their entire life.
By all means objectively critique someone's performance, that's what opinions are for (and like any player Ederson is by no means perfect) but to abuse someone on social media really is pondlife behaviour.
I personally believe we have a great goalkeeper, nobody else could do what he does for us and play the way Pep wants his keeper to play. Some of our players deserve more respect from some.