I'm so lost. Can you explain what this is about?

Can someone explain what the issue with this is? I'm sure there's some legitimate gripe but so far, in between the memes about people joining forces to stop this cartoon, all I've been able to surmise is that people think the style is ugly (even though it looks the same as 80% of cartoon network stuff), and that there are people calling it "heterophobic" and crying that the villains are straight or something.

Are there any non manosphere people that can explain what the big fuss is?