Since when does '-phobia' mean 'hatred'? If I suffer from arachnophobia, do I hate spiders?

Since always. It's an extreme dislike ( the opposite of "philia"). "Revulsion" might be a better translation than fear or hatred.

> Since always.

Is was used like that in Greek? Even the clinical meaning today does not include hatred.

> "Revulsion" might be a better translation than fear or hatred.

Fear does not require disgust. I am scared of snakes but I think they are beautiful animals.

I don't think fears are phobias though? If someone said there's a poisonous snake behind you, then it's not a phobia to move away.

Like many psychological things the line is more "when your response is damaging to yourself and others".

I knew someone with a phobia of stickers on fruit. Just tried to Google what that is called and found this comment from a sufferer:

"I can't have them on my skin and if anyone put one on me without prior warning I would panic and scream. I HATE HATE HATE ones on fruit"

Yeah, it's mostly fear. I blame my lack of coffee at the time and my non-English mother tongue :)

Though the line between fear and hate is quite thin and blurry in human psychology. The arachnophobes I know do, in fact, hate spiders with a passion.

I was making a comment about the trend in general. Some native speakers also agree with your definition.

> Though the line between fear and hate is quite thin and blurry in human psychology.

In some instances it may be, although the word 'awe' has no sense of hatred in it.

> The arachnophobes I know do, in fact, hate spiders with a passion.

Okay, well how about snakes? I'm afraid of them but I don't think anybody is disgusted by them.

> although the word 'awe' has no sense of hatred in it.

Awful has some meanings that are close

https://www.etymonline.com/word/awful

'awesome' does not.

Fear can lead to aggression, but it doesn't have to; you can be avoidant.