I used to think they were talking absolute nonsense. But I have found out that they are correct. My other blog covers philosophical issues, and people consider it to be quite intellectual. Literally, around 60-70% of the time when I linked to my blog on a dating site, the woman concerned simply stopped communicating with me. This baffled me, as I thought it would generally impress them, and they would be more interested in thoughtful men. But one of them explained that with her previous boyfriend she felt left out as she couldn't understand what her boyfriend and his friends were talking about, so she's not repeating that mistake.
I never talk about intellectual stuff in real life anyway, it's purely reserved for my blog!
Also see my Advice on getting a girlfriend.