http://www.theguardian.com/science/2014/nov/13/why-women-in-...
I don't think he's sexist, I'm sure he's a well-respected and well-liked scientist, and I don't think it's fair to judge someone's worth based on a short interview when they're not used to being in the spotlight.
At the same time, I would expect more professionalism from the whole staff at ESA. Are there any offices where wearing this [http://i.imgur.com/oJ9bVDt.jpg] shirt would be okay? People are making a big deal about the fact that a woman made the shirt for him, but they seem to be omitting that he provided the fabric and asked her to make it..
A large part of the rationale for missions like Rosetta is the inspiration it provides to the next generation of scientists. Hearing crude jokes about how 'easy' the mission was from a guy wearing a nudie shirt doesn't exactly invoke inspiration. It's a shame all of the other incredibly smart, professional, and inspirational people involved with the project are overshadowed by this.