Insects seem to trigger xenophobia in a lot of people. Maybe it is a good thing a close contact with real aliens is unlikely. We would suicide bomb them to hell...
"Xenophobia" has a strong denotation of unreasonable fear. Most fear of insects is rooted in truth- flies are repulsive because they transmit disease and seek rot, spiders can be poisonous, fleas and ticks suck your blood and spread disease- so I'm not sure whether xenophobia applies.