A lot of guys are surprised that girls can game. Sort of like it is impossible to fathom why they would want to in the first place.
This comic from XKCD is a good example of their impression of girl games:
The comic reveals discriminating jargon against women when doing tasks such as mathematics. When a guy does something wrong, it’s his own mistake. When a girl does something wrong, it is taken as a confirmation that girls are inferior.