There are many other things that people have claimed can be rejected intuitively without study through the years.

In the 18th century, everyone knew that real scientific physics only permitted a body to act upon another body through direct contact. When Newton proposed his theory of gravity, many people rejected it as pseudoscientific or magical because it claimed the stars and planets could exert action at a distance, without saying how they did it.

In the 19th century, everyone knew that life was on a different order than mere matter, because obviously you couldn't produce the self-moving and self-regenerating qualities of life with just stuff like you get in rocks and sand.

In the 20th century, everyone knew that the mind was more than just the brain, since simple introspection could determine the existence of a consciousness inexplicable in simple material terms.

The absurdity heuristic is an okay heuristic, but I'd be really really careful before saying something is so absurd we can throw away any contradictory experimental evidence without a glance.

The possibility I give to some sort of psi effect existing (in a nice, scientific way that we can study once we figure out what form of matter/energy forms its substrate) is pretty low, but not zero. I'm not even willing to give it a tiny one in a bajillion probability - remember that people who say they're 99% sure of something are wrong 20% of the time, and that since this issue is "politically" charged, vaguely defined, and possibly affected by knowledge we don't have, this is exactly the sort of thing we'd be likely to be overconfident on. If this was some calibration test, I wouldn't feel too good about placing more than 95% or so on the nonexistence of psi.

And if you're a Bayesian, a couple of good studies should be able to start manipulating that 5% number upwards