Though i agree they are harmless, they do not meet any classical, popular definition of cute

They have too many legs and move too quickly. It just freaks me out, man.

The reasoned par of my brain wholeheartedly agrees with you, and when I can convince myself to do so, I let them vibe. Unfortunately the reasoned part of my brain is powerless to stop the fight or flight response that happens when [spindly-legged creature] crosses my field of view. It simply happens.

If reasoning alone could overcome an otherwise unreasonable physiological response, then allergies wouldn't exist.

For me it's the fact that I lived in a desertic place for most of my life and centipedes there have a very painful bite

I know house centipedes are smaller and harmless but it's difficult to re-train the brain

Edit: words

For me, they manage to trigger the "SNAKE!" and "SPIDER!" panic responses simultaneously. The rational part of my brain likes them, the instinctual part tells me to smash it with a rock

They creep me the fuck out. I know they're harmless and beneficial to have but when I turn on my bathroom light and see one on the wall above my toilet I have to get rid of it. They're literally the only bug that freaks me out, even roaches aren't that bad to me.