Generally, Spiders are normal to be scared of. Villains who have lots of phobias or a phobia of everything can certainly qualify though.

I don't think so, phobias are a kind of mental illnes, and therefore I think it's kinda dumb calling a character cowardly soley due to them

Usually coward is defined as a villain that is too afraid of facing consequences or defeat

How is having a phobia a mental illness?

No, those are different, phobias are something people genuinely fear.

No. People having phobias aren't what we consider cowards.

Cowards are dishonorable guys who excessively fear for their life and prefer to run or hdie in danger.

@The Pro-Wrestler

Oh, okay. Thank you so much for letting me know! :D

No. As not only are Spiders a common fear even for people without Arachnophobia, such regard can also extend to needles, darkness, reptiles, enclosed spaces, etc.