- Called racist and sexist if you disapprove of affirmative action in schools or the workplace (which by the way, polls consistently have shown the majority of Americans disapprove of AA)
- Called transphobic if you don't want transgender women competing in sports with biological women, because of the unfair advantage
- Called homophobic if you think gay pride parades are not a good idea (even if you're not anti-gay, you just think parades in general are disruptive to cities and streets, and also don't want almost-naked leathered men walking around your neighborhood)
- Called sexist if you suggest that rape victims should go to the police as soon as possible after, rather than wait months or years later. Or that perhaps universities shouldn't be acting like courts without due process, and cases should go to the police instead.
- And do you remember when Firefox's CEO was forced to resign because he donated to an anti-gay marriage prop (that actually won with >50% of the vote?) I mean, maybe the guy was just for civil unions instead, who knows what his reasoning was.
None of these views would make someone actually racist or sexist but they are unacceptable to say publicly in left-leaning places like Silicon Valley.