Defcon7 said:
Is there some way to block user icons? Because there's one that's really, REALLY, bothering me...
I think I know which one you mean and yeah I feel the same but I doubt there's a way to do it.
It's why the guidelines say
Be mindful of your avatar choice, as they are not protected by blacklists. Please respect other members on the site and avoid avatars that show often blacklisted tags.
So even if it's not super bad if it's something that the vast majority of users likely have black listed it's probably better to not use it.