They don't associate with aliens then, because it turns them mean.
People who couldn't deal with aliens had to fight when they met.
I've been training them for decades on the best way to deal with aliens.
People were making friends with aliens, and scientists found more information on time zones.
"You know, the first time people of Earth meet up with aliens from somewhere out in the universe."
Want a consultant who can really help you with aliens?
Most of the support for extension is from groups that work with aliens.
"This may be the first human contact with aliens at our own level of technology, or better!"
That fact is usually enough to discourage marriage with aliens.
Yet what training is there, to meet with aliens from another star?