Why is Venom creepy?

Could you elaborate on why Venom, the character from the Marvel universe, is often considered creepy? Are there specific aspects of his appearance, personality, or behavior that contribute to this perception? Does it stem from his symbiotic nature and his ability to shape-shift, or is it more related to his violent tendencies and his often-unpredictable behavior? I'm curious to know what makes him stand out as a character that is often described as creepy.