Scientists are VERY thick skinned.
Being an interested outsider but having been close enough to see what goes on I'd disagree with this statement a bit.
Individual scientists are just that; individuals. They vary a lot in their personal traits. What is true, however, is that the "society" of science accepts that blunt criticism is not a no-no. Someone can point out that you have dressed poorly and it is expected. Well, a large fraction of them wouldn't notice that but it is an analogy for a "slip" in a hypothosis put forward.
It is expected that you will attack with guns blazing. In fact, I would think that the worst thing for a real
scientist would be to simply be ignored with polite noises made but nothing else. Only ideas considered worth the effort are reviewed carefully and critically.