I don't think the discussion is about whether or not he should be offended or take criticisms seriously. It's whether or not it's wrong to like large breasts in video games. Otherwise I'd agree with you on the matter that it's not reasonable to get upset over things said over the internet.
Also to your last point, I think that's fairly obvious. The criticisms of outsiders who are seen as ignorant of the culture in question, are not going to be received as well as those within the culture who are seen as knowledgeable. Anita Sarkesian (just an example) is not really known for a methodical and fair look at the things she does videos on. To many, it's a ,who the fuck is this lady to criticize what I put so much time and energy into, kinda thing. It's not a -reasonable- response, but it's very understandable, and not exclusive to the video game community.
Also to your last point, I think that's fairly obvious. The criticisms of outsiders who are seen as ignorant of the culture in question, are not going to be received as well as those within the culture who are seen as knowledgeable. Anita Sarkesian (just an example) is not really known for a methodical and fair look at the things she does videos on. To many, it's a ,who the fuck is this lady to criticize what I put so much time and energy into, kinda thing. It's not a -reasonable- response, but it's very understandable, and not exclusive to the video game community.