>>7153688Because they don't understand the character at all.
Electro is supposed to have a silly mask because it represents how the character operates. With Electro's powers, he should be an A level threat. Someone who's fighting the avengers. But what does he use his powers to do?
Rob banks.
He's a villain with an A level powerset, but he has no idea what to do with himself. The costume is representative of this. He's got these incredible powers and just slaps on this silly mask because he thinks it looks good.