I never really understood this line of argument. It’s possible to engage with something openly, yet reach a conclusion about what the available evidence says about factual circumstances. Interpreting someone’s account of an experience differently than they do themselves does not mean they didn’t have the experience, or that you are dismissing them.

For example, I’m an atheist, but I don’t doubt that many people frequently have religious experiences. I just think that there are more likely explanations of those experiences than that they are caused by a god. I still find religion and accounts of religious experiences fascinating, and I very much respect that it’s a fundamental part of many people’s lives.

Having an opinion doesn’t mean you dismiss everyone who has a different opinion.

No way. Modern research has demonstrated how unstructured and unscientific our reasoning is, easy to fool and game, falling prey to a plethora of biases. If anything, rejecting your own and other people's personal experience should be the default, because the information we gather when not taking the utmost care to calibrate our instruments is pretty much garbage. A quick example of this would be how unreliable eyewitness testimony is in trials, but of course the sightings of various unproven phenomena(sasquatch, loch ness monster, etc) are also a great example of our "personal experience" being put to the test and found to be useless.

To me, it's more plausible to believe that the world we "experience" practically does not exist, and our memories and perceptions very rarely match reality, than to concede that these particular collective personal experiences amount to evidence of anything.

no offense but I think you're unfairly and inconsistently dialing down your personal reliability for your subjective experience in this topic because this topic has the implications and emotional and psychological baggage that it does but you would be much more likely to trust yourself in your everyday life with the things that you already know. And I think that's reasonable. if I had some experience where there was a UFO or aliens I would definitely be doubting myself. But I think given time, or given repeated experiences, or given other people who had similar experiences and if I reflected on it I could definitely come to trust that what I experienced was true. Maybe that makes me unreliable... I mean I am unreliable my memory is unreliable my logic is unreliable my interpretations are unreliable my senses are unreliable. But I still have to piece together an existence just like everyone does. Just like I think you'd believe the things that happened to you in your everyday life. and I don't think we can discount other people's experiences so easily. Particularly if yeah so many experiences. Even if you have an unreliable sensor or sparse signals you can reconstruct an accurate picture, particularly if you have enough sensors. I'm not saying that all of the people's experiences means that it must be aliens I'm just saying it means that something is happening and I don't think it's honest for people to judge that as oh well this just means these people are unreliable. If that's true then it's just as equally likely that your judgment of them is unreliable too. There are more things in heaven and earth, Horatio, than are dreamt of in your philosophy.

Theory and Observation in Science: https://plato.stanford.edu/entries/science-theory-observatio...