Anything that makes normies aware of their hypocrisy is instinctively hated by them. They "love animals and the environment" but actively harm them with their lifestyles. Lazy, miserable people find self improvement and convictions offensive.
Cyclists are also a very visible and they cause cagie rage, which is always strangely out of sync with the inconvienice of a situation. A car being held up by slow traffic is remembered as "man, traffic sucks". A car being held up by one inconsiderate driver is remembered as "man, driving sucks". A car being held up by a cyclist is remembered as "fucking cyclists always getting in my way!!!"
The only way to solve it is proper bicycle infrastructure to make it easy and pleasant to bike. This will keep bikers and cagers out of each other's way and increase the popularity of biking so it becomes normalized. Also cyclists gotta at least obey red lights, I mean goddamn. Learn to trackstand or something