I’m totally willing to suspend disbelief and accept that aliens could show up, but then I want their ships to be designed for actual space travel, and I don’t want them speaking English unless there is a very good explanation for how and why they learned it. It doesn’t have to be “real” but I like for my stories to be realistic, assuming the imagined events really happened.
But, you know, I’m a nerd and my brain has a tendency to look for logic, even in fantasy.