So, I've never ran into this whole "big avatars" problem. You all have the same sized avatar to me it seems
That's not what big avatars are
A big avatar is some exploit when uploading your avatar that allows it to surpass the 75x75 size limit, but i think even big avatars have a limit of like 256x256 or something
This was more of an issue prior to the forums updating to SMF 2 because the big avatars would actually mess with the formatting of that user's posts, but since the update, the big avatar would just be cut off after a certain point behind the post