For the same reason that people will say "Oh that cat you have will trash your house and pee on everything!" or "That motorcycle will make you into an organ donor one day!" or "You're spending too much on that toy collection, you're going to not pay your bills!"
People don't usually tolerate anything that isn't what THEY like to do. It's not just snakes, they just happen to be an easy target because so many people think they are scary or dangerous. Shrug, just be glad they are being honest in their dislike rather than saying they are fine with them then later popping up with "Oh no, those snakes need to go" causing drama and lost time.
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