To some even the smallest of spiders is too big. It is a many eyed nope. But general consensus is that any spider who cannot comfortably sit on a quarter is firmly in NOPE territory. Ants are less bothersome but a solid inch long carpenter ant (and anything bigger) inches into nope.
Is there a nope size for butterflies?
FYI the worlds largest known butterflies are over a foot across and samples had to be taken with a shotgun because of how high they fly. Remember that scene in the Hobbit where Bilbo climbs that tree in the dark forest to spy out the lay of the land and meets all those giant black butterflies at the top of the canopy? That’s where that came from.