As a skeptic, I'll offer my opinion and my advice.
When talking to folks like me stay calm, coherent, and sane. Seriously. Most of the folks we deal with who are proponents of alien contact are,
well, nuts. Not "I believe something off of the mainstream" nuts, but Francis E. Dec Esquire
crazy. So keep your cool, and understand that at least part of our skepticism comes from dealing with folks like that before. Remember that if
we're willing to discuss it with you, we're at least open to the idea.
Second, don't take the skepticism personally. I've seen a lot of people, here and elsewhere, get quite agitated when questions about their theory
are raised. We're not saying that you're a bad person for believing what you do, but that we see some flaws. Sometimes these "flaws" are simply
concepts that you've been exposed to for so long that you take for granted, but are new to other people (Think "Dulce." Most people interested in
alien contact will at least have heard the name, but it's very far outside the mainstream.). In this case, the questions aren't even a real flaw in
your theory, just in its presentation.
Third, to be honest there are a lot of scam artists out there just waiting to take advantage of your hopes. Some prey on those who are looking to
make a fast buck (Nigerian money scam, anyone?), others on your need for personal contact (many of the scams targeting the elderly), and others on
your need for a more exciting world (aliens/end-of-the-world/etc). This doesn't mean that all people promoting, for example, theories of alien
contact are scammers, just that it isn't safe to initially assume the're legit.
To take this out of the context of ATS a bit, to hopefully take some of the emotion out: I'm a martial artist. I've been so for almost 2 decades
now. Still, every time I move and look for a new school I approach every school with a very skeptical eye. If you've ever looked into martial arts,
you'll have noticed that there's a lot of people out there promising a lot of things, and they can't all have the One Perfect Ancient Revealed
Martial Art™. Most of them, in fact, are full crap. My skepticism is a tool to cut through the BS and to find a good school.
In the same way, I have skepticism for anyone making grand claims. I'm not unwilling to believe what you have to say, I'm just unwilling to throw
everything away on the hope that, this time, you've got the Truth™.