No, you’re thinking of “Romeo In Black Jeans”, by Sean Penn’s less-talented brother.
That was popular? I assume you mean Chris Penn, and I had no idea he ever put out a song. Sounds like a really bad idea.
Jack and Diane by John Couger Lizard Strauss Monkeywrench Mellencamp.
For adults, that’s true, even being charitable. But even though I don’t especially like the song, one of my friends says it was “his” and his girlfriend’s song in high school because as a child there are more impediments to getting alone time with someone.
I secretly liked mmbop. Wannabe too. There, I said it.
No Myth (Romeo in black jeans) was Michael Penn.
I was once on vacation in Sardinia. Having a lovely meal in a lovely restaurant. The food was local and delicious, the service superb, the setting a quirky old building.
There was one problem. Their CD player had an issue, and no-one noticed. It played “All for one (all for love)” on repeat for an hour. I shall make no further comment.
Uptown Funk.
Terrible song, I don’t know why it was popular.
In what Isles of the Blest have you been dwelling, that you’ve never heard this horrible dreck? And can I come live there, too? I hear it on Mood Music’s rotation at least once a day, at work. ::shudder::
As BlankSlate noted, the song is actually called “No Myth”, and the singer is Michael Penn. Whom I understood to be a brother of the actor, but I might have been misinformed.
Unpopular opinion: Anything by U2 or the Stones.
The cover version is pretty good though:
Most annoying?
1-8-7-7-Kars-4-Kids.
Damn you. Now it’s stuck in my head, and there’s reasons to hate it beyond just the stupid jingle. Make it go away!!!
This far down, and no one has mentioned “Escape” (“The Pina Colada Song”)?!? 
Some real stinkers have been mentioned, as well as some songs I really like, but anyway you all got it wrong, maybe because most of you were fortunate enough to never have been exposed to it. I present to you the worst pop song of all time:
Nerve grating primitive melody and rhythm? - Check
Inane pandering lyrics? - Check
Horrible Austrian accent? - Check
Nah-Nah-Nah-Nah-Nah? - Check
Excuse me, I have to wash my ears with bleach…
I thought it should be used in a bank commercial.
“How can I get you a loan?”
That is truly inspired. Who says you can’t polish a turd?
Life is Life is not a great song. At all. But I don’t hate it. I feel about it the way I do about “Hooked On A Feeling”.
You mean “Oooga-chugga! Oooga-chugga!”? 
It’s no Crazy Frog, but for usually-reasonably-respected songs that I have an irrational hatred for that rub me the wrong way, I think Billy Joel’s “Piano Man” fits the bill for me.
I love a lot of the songs mentioned here. “Jump Around” by House of Pain is on my walking mix, “Sweet Child o’ Mine” by Guns and Roses is always welcome on my daily commute, and even “What’s Up” by 4 Non-Blondes is a great song. I was annoyed with “What’s Up” in in 1993 because it was overplayed but after I didn’t hear it for a decade I warmed up to it again in the 2000s. Even “We Built this City” isn’t annoying. It’s vapid and milquetoast but I can’t say I find it particularly annoying. Perhaps I’m too easily entertained?