Please don't use racist language on HN.
Edit: To be clear I used those examples because they are the majority in America (which I should have been more clear about) in an effort to point out that the majority often does not pay as close attention to the problems that arise from being in a minority.
What you said was both racist and sexist. You're saying that a group of people (based on race and sex) are "not going to ..." do something. Speaking in generalizations using these classifications is generally regarded by most folks as racist/sexist.
It can be tricky though. You might be right, but you'll still be called out for it. For example, the peoples of eastern asia are statistically less tall than their counterparts in western europe. Nevertheless, "asians are shorter than europeans", is still a racist statement.
Unless you can see, as well as explain, how the generalizations you're making benefit the conversation, it's probably best to avoid making those types of statements in the first place.
Racism itself might be "wrong", but that doesn't mean you can't be racist and still be "right" in your assertions. That's the tricky part.
"Racism" (note the -ism to denote a system) requires a social, political and/or economic system by which a dominant group retains power over other groups. By that widely-held definition, it's literally impossible for a non-member of the dominant group to exhibit racism.