Is it rude to tell someone their fly is open or to not tell them?

If you tell them quietly and discretely, you are doing them a favour.

Well… Would you want someone to let you know? I agree that as long as you do it quietly, it’s the right thing to do. Not telling someone is just kinda mean.

At my child’s school Christmas concert last December, a young boy about 6 years-old walked up to me and told me I forgot to “zip up my fly”. “Your fly’s still open mister,” he matter-of-factly told me. I was a bit embarrassed at the time, but I would have rather been told than not. Can you imagine if I went through the entire evening meeting teachers and other parents with my zipper undone? Egads! Lol.

There is a right way and a wrong way to tell someone.

HAHA!!! DID YA FORGET TO ZIP YE PANTS THIS MORNING!?—wrong way
—hey dude…your fly is down——right way

Id rather ya tell me then let me walk around all day with my dick hangin out. Just sayin…

You should always let someone know if their fly is open, if they have food stuck in their teeth and basically anything that could prove embarrassing were people to notice.

Not at all, as long as it is done discreetly.

Do unto others as you would have done unto you. I will tell strangers when their tags are hanging out or if they are flying low. I think it is cruel not to.

Your costume is about to malfunction.

I want to know. I also want to know if I have food in my teeth or toilette paper stuck to my ass. Just please do it in nice helpful manner, not announcing it to the world, just privately letting me know.

What @JLeslie said. It’s one of those things like lettuce stuck between your teeth or chocolate on the corner of your mouth—yes, it’s embarrassing to have to be told about it, but it’s more embarrassing for nothing to be done about it. As long as the person is discreet about telling you, I don’t think it’s rude to do so at all.

I once heard about a student who botched a presentation because his fly was down. It was the kind of presentation where your personal appearance figured into the grade. The presentation script required him to move, but he couldn’t without the professor docking points for improper dress.
Alerting the man to his condition beforehand would be considered kind.

“Oi mate, the troops are hanging out the barracks.Put them away there’s a good chap.“Perfectly civil way of dealing with such an incident.

There are a few people I would tell. I wouldn’t tell a stranger.

I would tell and I would hope that someone else would tell me.

I would want to know if my fly is down, so I believe that you should tell someone. I am not saying shoot it from the rooftops but let them know.

I agree with what others have said here. I think it is rude, once you notice it, to allow someone to go on with their fly open, with spinach stuck between their teeth, with toilet paper stuck to their shoe, etc. That moment, where you tell someone this or that, is extremely awkward for both you and the other person. But…. wouldn’t you really rather have someone tell you than walk around all day like that?

I would discreetly tell them “You’re flying low”. And I would hope that if I was flying low, someone would tell me.

Most people want to know about any appearance faux pas and would prefer to hear about it in privately and with care.

Someone once told me that if it is something that can easily be fixed, like the zipper, toilet paper on a shoe or tucked in the back of trousers, ink on face…let them know. If it is something that cannot be readily fixed and really is not of importance, let it go. A couple of co-workers admitted that they’ve worn one black shoe and one blue shoe to work. Once someone pointed it out to them, they were embarrassed for the rest of the day.

“Pssst! Hey, Mac! Barn door’s open!”