I used telescopes for some times, indeed Venus or ISS are often interpreted as UFO. Venus is visible in daylight and ISS has truly something alien with its apparent magnitude and majestic speed.

But when someone looks through a telescope, she sees less than half a degree wide, often only a few dozens of arc minutes, so her field of view is less than 1/10,000 of the sky. It is unlikely she will recognize a fast moving object, plane or whatever.

I also seen something strange in mid-day with naked eyes, I thought it was an Iridium flare, but when I checked there was no flare possible at that place and time.