Lou Reed is the definition of cool.
I think you're confused about what 'cool' means. Both of those bands are usually viewed as great, but a little goofy.
Unless you're being totally cheeky, no-- I'm not confused about what "cool" means: It's a completely subjective term, and it's my opinion that these artists that appeal to me are "cool". You think Lou is cool; that's your opinion.
As for Daft Punk and Beastie Boys being regarded as "goofy", it's all good. I think they're more eccentric and genuine innovators, visually and sonically-- my definition of cool.