In the UK, this kind of thing is (unfortunately) legal. Look at Virgin Atlantic's advertising ("No Way, BA
/AA" or "BA can't keep Concorde up" etc), Ryanair's frequent "We're better than Easyjet" announcements, Easyjet's former attacks against Swissair and BA
, Stop Go!").
Outside the aviation world, the same thing applies. The result is that some companies are increasingly bitchy, with Ryanair leading the way in terms of handbag-swinging menace...
Then again, advertising in the UK is tasteless in general. Whereas increasing nudity is apparently the German TV
ad focus, the UK do that (showing a long series of nude butts in an advert for toilet paper, with subtitles describing them - "firm", "soft", "cute" or whatever) as well as stuff that's frankly tasteless (Black Cab adverts insinuating that most minicab drivers are rapists and should not be trusted, anti-smoking adverts showing real dying people, lots of "drive more carefully ads" with gory CGI car accident footage, ....)
If you want more statements like that, just keep reading all the news releases by www.ryanair.com. Easyjet have gone a bot more quiet lately.