I think it's hard to prove a negative, such as "there are no extraterrestrial intelligences out there." The universe is big, and time goes in all kinds of crazy directions, and we only have a very limited view of reality to work with.
But after several decades of interest in this subject, I absolutely have to agree that there has been nothing discovered so far that in any way proves
or indicates the existence of any kind of life or intelligence not originating from Earth. Sure, weird things have happened, and continue to happen.
But nothing specifically having anything to do with ET life or intelligence.
It's fun to imagine and read the stories, though.