There is no substance that is absolutely safe at any level for humans. Even water will easily kill you (over-hydration is a real risk, especially for athletes).
FTA:
> The EPA says glyphosate is safe up to 2 milligrams per kilogram of body weight per day, and Bayer, who now owns Monsanto, claims that its safety for consumption by humans has been proven by years of research. However, the World Health Organization's International Agency for Research on Cancer, among many others, disagrees, and considers glyphosate a potential human carcinogen.
The three claims are completely compatible, the WHO isn't disagreeing, it is simply listing as a potential carcinogen. This is actually less bad than eating salami, which is actually a known carcinogen.
Regardless of the actual safety of glyphosate, the article is journalistic crap.
And that's before we get into the actual amount of beer you'd have to drink to ingest any significant amount of glyphosate...