It's fair to say that there has never been a better time to be a man with facial hair. Honestly, everywhere you look these days you're probably more likely to see a bearded bloke than you are a clean-shaven one. This is even the case in movies: just take a look at the lineup of the Avengers if you want an example: seems like the vast majority of those costumed superheroes are bearded. Maybe they all go to the same barber? Who knows.

But one thing that still hasn't had a comeback is the humble moustache. Yes, when you think of a tache, most people will envisage Freddy Mercury or one of the Mario bros. However, it seems as though a few of the biggest stars in the MCU have championed moustaches before, which has led to a hilarious rivalry on social media between two A-listers. Is this Civil War: Facial Hair Edition? You decide.

The trouble began earlier this week, after Iron Man star Robert Downey Jr took to Twitter, and posted a throwback image of himself, Captain America star Chris Evans, and the Incredible Hulk himself Mark Ruffalo, all sporting trendy-looking moustaches. Downey Jr captioned the snap: "Ok this time it's real—Who wore it best, @ChrisEvans @MarkRuffalo?" As a result, the post spurred a major chain of reactions from fans and other MCU actors. Check out our favourite responses below:

[[twitterwidget||https://twitter.com/RobertDowneyJr/status/1108393509411672064]]

[[twitterwidget||https://twitter.com/vincentdonofrio/status/1108398660771962880]]

[[twitterwidget||https://twitter.com/brucesnat/status/1108395332361248768]]

[[twitterwidget||https://twitter.com/valkyrieIoki/status/1108393979903512577]]

[[twitterwidget||https://twitter.com/HisDuckling/status/1108394164767653889]]

[[twitterwidget||https://twitter.com/IvanaIvLukic/status/1108394209663504385]]

[[twitterwidget||https://twitter.com/thababes/status/1108395628797792256]]

[[twitterwidget||https://twitter.com/Katl0204/status/1108393725200384001]]

[[twitterwidget||https://twitter.com/_DieGrinsekatze/status/1108394280010350594]]

10.

[[twitterwidget||https://twitter.com/Yoshy7Ma/status/1108403354269569024]]

But are moustaches better than beards? Or are guys actually better off shaving? Don't worry: we have the answer. Check out this article we penned all about the hottest kind of facial hair according to women.

Hollywood stars start hilarious feud over their facial hair on social media and everyone is weighing in