You were in Brazil though, not the USA, wasn't that right?That group has a lot more political influence on many institutions in the USA than in Latin America, I'd think, so the two places wouldn't necessarily be comparable.
Additionally, cultural influence has very little to do with raw numbers of people. Polling people on the street then deciding that because such-and-such a view is common / not-common, therefore it must have social power / lack social power isn't a valid deduction. Very small numbers of people holding specific views can in fact have a much larger influence on the culture as a whole than raw numbers of man-on-the-street thinking.
The type of people who hold SJW views are heavily dominant in pretty much every faculty of American universities except for STEM and business / finance, and certain schools such as "dentistry". There aren't many social justice people trying to kick the doors down to be dentists.
Jonothan Haidt mentions that only 20 years ago, American university faculties were split 3-to-1 liberal vs conservatives. So, conservatives were a minority, but there were still enough of them that you could have a debate about stuff and have different viewpoints covered. Now, it's 15-to-1 liberal-to-conservative. But, that's still factoring in a ton of fields where political affiliation isn't an issue. Factor those non-left fields out, and the fields which deal with culture and communication are something like 60 liberal lecturers per 1 conservative lecturer in the USA - and those lone university lecturers have learned to keep their mouths shut about any conservative viewpoints they might hold, since that's a surefire way to have students attack you with Title IX complaints. So, USA college's humanities fields have an overwhelming amount of orthodoxy, and there are tribunal systems for punishing lecturers who even so much as hint at some non-PC viewpoint. It only takes one student in the class who is an SJW to drag a lecturer through a months-long investigation into something everyone involved can clearly see is bullshit. This actually happened to Jonothan Haidt personally btw. Lots of other American lecturers are purging their courses of anything remotely challenging to students because they're all scared that some material they present could be viewed as having racist/classist/ableist/sexist connotations. So say bye bye to students learning the classics, or most philosophers unless they're squeaky-clean SJW-approved philosophers. The state of modern American colleges vis-a-vis SJWs is part Lord of the Flies, another part The Crucible.
So, yeah, go on the street and poll people and you won't meet many avowed SJWs, but go to American universities and poll the humanities professors and students, those people who are going to be framing the next era of culture, and you're basically not going to find anyone from the conservative half of the population whatsoever, and a good chunk of the most prominent ones will be full-blown SJW.