I am just going to say no, no it is not. Look how commonly used they are I mean this website that is the home of thousands and thousands of SEO services uses drop down menus as seen above.
Tiny things like that are not something to worry about when it comes to SEO because if you do you'll just slow yourself down,
June 10, 2012, 1:14 am
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No
June 10, 2012, 4:34 am
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I don't think they are but it really depends on how it is built. But they could have some negative impacts.
June 16, 2012, 7:33 pm
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It depends
June 19, 2012, 10:38 pm
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As far as I know, they are not.
June 20, 2012, 11:35 pm
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some times...
June 28, 2012, 6:02 am
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I am not entirely sure but I think that if the URLs linked to by the drop down items are visible in the code then Google will follow them so it should not be a problem.