Self-censoring is just getting stupid nowadays. I can't remember which social media platform it is, but you have people censoring words like k*ll, and I just find it utterly ridiculous.
It kind of is, but it depends on the continent from what I have found. After looking around a bit, it seems that this wouldn't apply in Africa or other places. It's probably partially true, but I couldn't find out exactly what the conditions were.
But...
I am not snake expert, nor am I even snake smart. However, it seems that the best course of action is not to fuck around and find out.
It's not even an indicator, there's places where the opposite is true, this is like the myth of the vertical slit pupils meaning they're venomous, there's no actual correlation, this just coincidentally works in areas with few snake species, but you'd have to know that ahead of time, and since there's few species wherever this does work, you might as well just learn what the venomous snakes look like so this is practically completely useless.
This usually happens when somebody learns that in their local area this rule applies, and then assumes it applies everywhere.