Your typical internet conspiracy theorists

I don't think this exists as a group.

They make up things to fill in the gaps of their theories

Yes. The big difference between conspiracy theories and (good) journalism. Sometimes these gaps are highlighted as speculation, but often they are not. The more evidence a conspiracy theory has backing it, the closer it gets to journalism.

refuse to change the made up bits even when they find evidence to the contrary.

People like this are super easy to argue against because you can provide the supporting evidence and they shut up.

The general contrarianism of the internet pushes people to think the opposite of establish facts.

I don't think it is contrarianism. In previous decades traditional media had a monopoly on one to many communication. Now anyone can broadcast any information, true and false, to a worldwide audience.

In the end it's just a mess of made up shit that conforms to the emotions of the person that made it up.

Sometimes yes, sometimes no.

These conspiracy theories are promoted among those with similar feelings. They push way more lies than anyone else.

Easy to do. For example, you are now expressing a feeling, not stating a fact.