This is from an article in The New York Times: Fox News v. Robert Mueller
If only we could dismiss Sean Hannity, Jeanine Pirro, Laura Ingraham and the other well-paid propagandists at Fox News as though they were harmless drunks at the end of the bar, ticking off their conspiracy theories to anyone who will listen. Unfortunately, the guy sitting on the next stool is the president of the United States, and he’s all ears.
I've looked up several dictionaries for "tick off." Mainly there are three meanings: "infuriate", "reprimand", and "to mark some item on a list"
I am going with the last one, but having a hard time clearly understanding the context. I kind of have a guess though. Is it something like "enumerating/pointing out/laying out their conspiracy theories to someone"?