I think everyone must know the feeling of having said something stupid. My foot-in-mouth moments really haunt me though.
When I was a little kid, my mom and her boyfriend and I went to Disney. She had been complaining all day about blisters on her feet from all of the walking. I must have gotten tired of hearing it because I said "If it were up to you we wouldn't even be here." Just a classically ignorant thing to say.
A few years ago, a coworker was taking a L-size t-shirt into another room to try it on.
Her: "I'm gonna try on a large."
Me: "Okay, good luck."
Of course, she took this as an insult to her weight. I was completely mortified since I didn't mean anything at all like that. At the time, telling people "good luck" was just a silly thing I did, but that time it had an unintended meaning.
During a conversation with my girlfriend's father, he was showing a vacuum to me.
Him: "This thing will suck..."
Me: "Whoah, whoah, whoah, I already have a girlfriend."
This is almost so stupid a thing to say that I still can't believe I said it, but I did. But it worked out okay because I ended up marrying the girl
There are many more but I've mercifully blocked them out.
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I'm not autistic, although I do not consider myself neurotypical. I've been diagnosed with major depression and socially avoidant personality. Bonus: bipolar disorder.
~My soul must be iron, because my fear is naked.~