I don't think any movie has infuriated me more than Little Man. The main character seems nice enough but every joke is on him, it's so unnecessarily mean-spirited, and worse for a comedy, not very funny. I saw it when I was young, and it was still too juvenile for me. Not to mention (I haven't seen it since then, but I imagine) it's pretty offensive against people with dwarfism. Man, I hate that movie so much, even after all these years lol.

More recently, Fanf4stic was absolutely atrocious. It had some cool concepts with the characters and transformations, and then just ended all of a sudden. It's like they ran out of budget halfway through. And way too long of an introduction, way too boring.