First of all: The ban on plastic straws is clearly an attempt to distract from more pressing isses when it comes to protecting the environment. That said, outside of a few people with disability, straws are basically pointless - banning them has no effect on most people’s lives.
Herbicides/pesticides make agriculture more efficient. Banning an effective pesticide would probably lead to either decreased production of agricultural goods (bad for humans, especially poorer people) or an increased need for space (which might be worse for the environment than the pesticide itself).
Ultimately glyphosate wasn’t banned due to its impact on the environment, but due to its suspected carcinogenicity.