Spoiler alert: It's not the worst song of all time. There is no one single "worst song", just as there's no one single "best song". It may be one of the worst, sure. But when doing something this subjective, there's no way everyone in the world universally agrees on everything...including "worst" and "best".
I don't care how many "experts" they asked or whatever, it's not the worst song. It always bugs the heck out of me when I see clickbait crap like this. If they think "We Built This City" is worst than...say..."My Pal Foot-Foot" by The Shaggs, then it just means this writer is full of shit.
On this side-topic, Wikipedia has trouble writing e.g. "worst X of all time", because that can't ever be an objective fact... so instead it has articles named "List of X considered the worst" and "List of X notable for negative reception", to which things like "Worst X of all time" redirect:
Everyone already knows there is no objectively worse song, and the writer knows everyone knows. It's hyperbole to emphasize the writer's opinion that it's a really bad song, an inconsequential rhetorical flourish no reasonable person takes seriously.
I don't care how many "experts" they asked or whatever, it's not the worst song. It always bugs the heck out of me when I see clickbait crap like this. If they think "We Built This City" is worst than...say..."My Pal Foot-Foot" by The Shaggs, then it just means this writer is full of shit.