Why not?
> theirs don't seem to exist
> bow ties are ok
Of course bow ties are OK. Nonetheless, a scientist wearing a bow tie reinforces negative stereotypes. It's sad, but true.
> people don't hate on Feynman for having long hair or being a supposed sex swinger
That's because Feynman didn't do those things on TV. If Bill Nye wants to wear a tutu in his private life, more power to him. But if he wears one on a TV show about science I think that would indicate some really poor judgement on his part.
> Bill Nye also engineered a part that was used in the 747 while he worked at Boeing
So? What does that have to do with the Mythbusters?