Human's nature has always been the same, although behavior patterns change depending the current moment and external influences. Right now we have an important phenomenon we didn't have in previous decades, at least with so much influence and contact with the masses: the internet. It has totally reshaped the tendencies, interests and behaviors of society, including soccer players, who are more like celebrities than anything else right now.
These players have never been moral standards on building a family and walking straight in life, but they did their jobs with excellency. However, now with internet they are more concerned about boasting a luxurious routine at parties, wearing fancy clothes, displaying a new hairstyle each new day, displaying how influent and connected they are with the world of celebrities in order to collect most likes, comments, shares and fans as possible.
On the other hand, in previous times, players did enjoy parties and messing around, but they didn't have the need of being idolized for that by the public. They had the conscience of having a responsability and a performance to be delivered to the nation. Nowadays, it looks like players don't care at all. If the game is lost, at least they will receive some million likes on social media crying in a picture, while receiving another million dollars from sponsor brands.
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You keep telling some crazy stories, how old are you? Read Rooney's memoirs about how he spent his leisure time: “If I had a free day, I locked myself in the room and drank.” And Rooney was no exception, alcohol was a huge problem for football players. Do you think this is a professional approach to business? Why do you think modern players play longer and better than previous generations who were just recently? Not only because medicine is better now (although this is also one of the reasons), but because if you now violate the sports regime, you will simply be kicked out of the team or, for starters, deprived of the millions that are due to you under the contract. To drink and be unpunished you have to be at least Neymar.
As for showing off, it in no way cancels out human nature, but once again confirms that now football players are under stricter conditions and are forced to be more professional in all areas of life.