As others have pointed out, a lot of it is just people mindlessly following the herd. This is NOT to say that no criticism of Maguire is warranted, but the extent to which it is taken is patently ridiculous. I mean you have people within our own fanbase who are using tiny clips like the one where Antony's facial expression drops from celebrating with Dalot to Maguire as proof that he has no friends at the club and must be a massive cnut behind the scenes. We even had people saying the bomb threat was faked.
To be honest, I don't mind the memes quite as much. Sure, they're daft, but ultimately whether it's fair or not they somewhat come with the territory and Maguire's not the only player who faces it. What's more irritating to me is that some people can't just leave it at "Maguire isn't good enough". They have to actively despise the guy, which is a bit mental to me.
Most people respond with "Look at his arrogant interviews!", but anyone who puts a second of thought into these stories and isn't an imbecile knows what's going on. Maguire isn't just bringing up the fact that the team have actually done quite well with him in the side, or that he himself has had a very good international career, out of nowhere. It's because journalists are asking him questions to get those responses, like "What do you say to those who question your inclusion in the England squad?" They then cut out the question they have, take the most juicy part of the quote and put it in a headline, and wait for the clicks and rabid reactions to come in.
Essentially, I think the extent to which some people take their vitriol towards Maguire is a bit insane. He's not been good enough to justify his price tag, and I'd probably sell him in the summer. I don't feel people need to take it any further than that, really.