Do you think everyone that has pointed out where Ronaldo is better has encountered this kind of reaction? No-one thinks Messi is the best at every aspect of the game, plenty of people share your opinion on Ronaldo being the better athlete...very few people would use how they look topless as proof of it, though. That's the problem. Ronaldo being more toned and muscular is not what makes him a better athlete than Messi.
No, but as being athletic is defined thusly:
"physically strong and well-developed; muscular" tfd.com
"characterized by heavy frame, large chest, and powerful muscular developmen" - Merriam
Which one fits Ronaldo and which one fits Messi? Saying then that it depends on how you look at it is all about how you look at it, not at how it is defined and what athleticism really is about.
I don't think I'm too far off the mark. Don't you think Ronaldo's game has benefited from being extremely atheletic? Don't you think Bale's has? Giggs has a completely different build than Bale, so he probably wouldn't benefit from it as much. Giggs was, imo, a better player than Bale - and my point has never been that Ronaldo is necessarily better than Messi. My point is that one should accept that their games are different and that Ronaldo can do things Messi cannot, and vice versa.
One of Ronaldo's main strengths is his athletecism - he is extremely fast, running with and without the ball. How often doesn't the team just put the ball behind the defense for Ronaldo to run at - no defender keeps up with him. You cannot do that with Messi, so they play a different game - that is pretty much what I said about it.
It's all getting quite silly as I opted to talk about them being not similar in terms of build as proof that they are very different players, then people start talking about licking chests, legs that are sexy and what not.
Ronaldo is as good as he is much due to his extreme athleticism, whereas Messi isn't. To call Messi a better athlete is just pure and simple bs. Ronaldo is clearly the stronger and better athlete, but Messi may be the better footballer - not all agree on this, so why laugh every time someone says it? Their stats are pretty much the same, it has been argued times over that Messi probably plays in the best team in history. Some people just prefer Ronaldo's directness and physical aspect of the game, whereas some prefer Messi's technique and flair.