Honestly the self-insert hate is super childish. It's very 2009. Hardly anyone cares about that kind of thing anymore, and the people who do stick out like sore thumbs and look like jerks when they are rude to people who are just trying to have fun with OCs and self inserts.
I'm 24 now and I remember back when I was 14 the internet was far more hostile to that sort of thing. Now it seems like it's only a very small group of people and they tend to get called out on it.