If however only or predominately females encounter attitude and males dont, then it is likely gendered issue. And vice versa.

People tend to assume that I do frontend and try tu push me toward ui design side of things, despite me being completely crappy at that. It was real problem only once, normally I can easily negotiate different position. But, it requires me to often explain that I really cant design - I dont have to explain I dont do any other technology to avoid position, ever. People dont assume me to know sql, databases, server, java, but they do tend to assume me to be good at design.