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@vetuste -- apologies for the delay in response. I was travelling most of the day, got home late, etc etc. Saw it but didn't have the time to put a reply together.
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I guess I don't really know. I'm uncomfortable with having people who express opinions like Tim Hunt did carrying on in their job. On the other hand, is it enough justification to sack someone? Probably not, no. If I were on the committee that decided whether or not he could stay I would probably press for some sort of formal reprimand or other, maybe request a full, unreserved public apology, that sort of thing. It might also depend on what previous form he had, of course.
The thing is though that comments like these, especially when he effectively persisted with them, send a really bad message. It's true that office romances can be a distraction from work -- hardly unique to science, of course -- but this is not "trouble with girls". It's true that criticism of work has to be perceived as separate from personal criticism. I don't think this is "trouble with girls" either. Note he even went on to say, apparently, that he was in favour of science labs being single-sex, so this is more than just a badly-worded comment on office romances. The way in which he phrased his comments delivers such a bad message and, while his sacking or resignation may be a step too far, I would rather see an overreaction to this sort of thing than not enough of one.