[onewaystreet]

It's hard to say that he was disrespecting his colleagues considering that not one of them told him not to wear it. Even if they were scared to do so you would expect someone of higher or equal status to him to say something if it was really seen as a problem. IMO this is a culture clash between American and British culture. In the US it would be unthinkable for someone to wear a shirt like that just because it would be seen as unprofessional, even by a misogynist (which I don't think the Dr. is). In the UK they don't take things like that as serious and are also more tolerant of sex images. It's quite likely that no one thought anything of his shirt until people (Americans) started complaining about it on Twitter.

[Evolved]

Do you think they didn't tell him not to wear it because they didn't deem it offensive or perhaps even because they are scientists and engineers that determined that it is merely an article of clothing and it would be prudent to wear any shirt in lieu of going on camera not wearing a shirt at all? (I hope you appreciate the humor in my response as I upvoted yours because I agree with your thoughts on the matter).