Chelsea FC have a Paddy

Outside the Chelsea Football Club Stadium (Stamford Bridge) the 'bookies' Paddy Power have recently placed a billboard. On the billboard it says "FERNANDO. We’ve got an onion bag you can actually find. It’s in the burger van mate. Get your hair net on". This was an addition to the many jokes about Fernando Torres who has had a poor performance since joining the club after a £50 million deal. 
Apparently, according to the Daily Mail Chelsea have now started legal action against Paddy Power. 
The amount of coverage on social media this picture has received has made it good PR for Paddy Power but for Chelsea is this good PR? 
Is this a good use of advertising or is Chelsea right with not seeing the funny side?