You should, if you don't already, offer your services as a screenwriter for generating just barely plausible obnoxious characters and emotionally fraught scenarios. Some might work better for comedy (a la Seinfeld).
Very creative! Very off base. But very creative.
Here are some more!
Maybe their shoes were untied when they had their first kiss, and every time they have to re-tie an untied shoe, it brings back pleasant memories.
Maybe their parents restricted their privileges until they learned to tie their shoes and now any talk of learning anything about tying shoes forces them to relive the powerlessness and unfairness they felt as a kid.
Maybe it's part of their style. Cool guy, beer in hand, messed up hair, untied shoes sometimes. Yeah. You know. Nobody's gonna overestimate him. And that's how he likes it.
Maybe I lurk around playgrounds, waiting for some kid to trip on their shoelaces so I can leap in and impose my white colonialist shoe-tying culture when the oppressed classes are at their most vulnerable.
Maybe my nemesis has always dreamed of posting a "one weird trick keeps your shoes tied perfectly!" YouTube video, and to prevent them from monetizing this as heavily, I've taken an oath to spread that one weird trick as widely as I can before they get around to making the video.
Maybe it's just my opinion that their shoes are untied, and their opinion is that they're not. I should learn to agree to disagree.
Maybe I'm such a pathetic lonely loser that I will take literally any excuse to talk to people, but because of the pathetic loser part the only think I can think of is to criticize their shoe-tying technique. Man! How pathetic.
Maybe they like their shoes coming untied now and then because it shows solidarity with their kid whose shoes are coming untied all the time and really can't do it any better. Don't feel bad lil' champ! Mommy/Daddy is just like you!
Maybe my way destroys the shoelaces, which is intuitively obvious to everyone but me, and they can't afford the hassle and expense of buying new shoelaces all the time. I mean, who even does that?
Maybe I don't actually have a different way. Maybe it's the exact same way, and I'm the only one too bamboozled by the presentation of it to not recognize that it's identical.
Maybe you thought it would be amusing to teach me a lesson about minding my own business, and whenever someone's shoes are untied near me, your agents nip over and go, "Hey, psst, some guy's gonna hassle you about shoelaces of all things. Just ignore him."
Maybe we should be celebrating diversity rather than maintaining a narrow fixation on arbitrary outcome metrics like "are the shoes tied". Most people get it; I'm out of touch.
Shall we go another round? Maybe Argumentative Penguin would be willing to judge. We could have multiple categories to compete in: implausibility without impossibility, comedy, offensiveness, most likely to confuse a Brit, etc..