Well, it's technically correct. The sense I get is that most people aim their "generic" comments at the 95% (straight, cis, etc). Because reality, in a statistical sense, is heteronormative. But being inclusive is kind as well. There's no exact answer - if you are 100% inclusive, people scoff at you being "politically correct". If you're not, different people get offended.
It is more like aiming generic comments at a subset of the population makes that subset "normal" and the other "abnormal" and one must conform to the "normal."
I always hate it when people say "women do this" or "women think this" because I often don't do or think that. Plus within the women I know there is a large range of personalities, actions, thoughts, beliefs, motivations, etc. It reduces women down to a stereotype.
