He's not a very private person I'd say.
But I agree with the general sentiment MOA.
Regardless of his public lifestyle, which seems to be par for the course these days, many millennials feel the need to post all their activities to social media,
Lewis falls into that category, but ultimately he is still a private citizen, the only reason all this snap chatting is getting more attention is because it has coincided with his perceived slump in form on track.
Lewis is doing what I did when I was younger (without the jet-set lifestyle), I went out and partied with my friends and went back to work the next day (usually with a hangover),
Lewis just does it in the public eye, even if he didn't snapchat his exploits, I'm sure the tabloid press would be hounding him for a story.