I can only assume that not many people in this thread have been to a traditional gay bar, where the testosterone drips from the ceiling. Or have any experience of online gay dating, where two of the most common statements on a profile is "no feminine guys" or "straight acting only".
The more flamboyant, feminine acting gay men are the ones that get noticed, so people assume that they are representative of the majority. In reality, most gay men don't conform to such stereotypes.