Not exactly. Buttcracks are gross, and may easily tarnish a community ("hey, look at those fat ass nerds"). I've been at the Utrecht tournament last week: from my seat, I had a direct view on at least two buttcracks, which were both much bigger than in these pictures. Even for the players, it's not a great sight.

However, shaming these guys on social networks is a big no-no. This guy should have went to a judge so that they could talk and educate the concerned people, rather than taking pictures without their consent and posting them online. For this reason, WotC banned this guy from official tournaments for something like a year.

The Magic community (especially the pro community) has a sad habit to publish everything on social networks, even when it should remain out-of-sight (in the past month, two other 'scandals' like this happened, which clearly show that we have something to work on).