Football is for wimps, real men watch rugby!
We all know the guy. Upon finding out you like football he insists on giving you a lecture about how he hates football because it's full of overpaid wimps who roll around clutching their ankles for 10 minutes every time they get tackled. He then goes on to tell you about how he only watches rugby because it's full of real men who can take a stud to the skull and keep going. Of course, rugby players are also all respectable gentleman whilst footballers are just arrogant moaners.
I can't tell you how bored I get of hearing this argument.
I like rugby but I prefer football because I think it's more entertaining to watch and more fun to play. If rugby was the multi-billion pound industry that football is then rugby players would be getting paid just as much as footballers do. Some footballers do have a habit of diving but most of them are incredibly skilled sportsmen who deserve just as much admiration for getting to the top of their game as any other athlete. The reason rugby players are tougher is because rugby is a full contact sport requiring brute strength whereas football isn't. Also, there are enough arseholes in rugby and nice guys in football to break the stereotype on either side.
If reasoning doesn't work with the bloke in the pub who is desperately trying to defend his masculinity by shouting about how he only watches a sport for real men then you can drop to his level and point out that he enjoys watching large groups of muscly men in small shorts tackling each others waists. That often works.