I think everyone pushes them? Maybe I just don't get what you mean, but it's not a bad habit. Since they follow my characters around, when I want to move sometimes they're blocking the way. Unlike villagers, I've never seen them get upset about it so I assume the game is designed to let you do it since otherwise it'd be more annoying to move in the shops.
I've also attempted to push them out of the door because I was bored.
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I do this too much.
It's really fun to push them, but I enjoy running away from them more.
I find I push Reese more. She just always seems to be in my way! XD
Like the others, I like pushing them for fun. Running away from them is more fun though, because it's funny to see them struggle to keep up and they have to turn the corner to get to me, but by then I'm already on the other side
Speaking of Nook, I once read on the Animal Crossing Wiki that in Animal Forest e+, on Christmas day, if you wake up Tom Nook by hitting the door with your shovel, he will come out and hit you on the head with the shovel, meaning you can't play again until 7am.
not sure if serious or sarcastic