It exists just like Left Wing sexism and racism exists, not to mention LWers who constantly lie, use straw man arguments and other deceptions to sway voters.you're right sexism doesn't exist.
As mentioned previously, it's the high degree of partisan bullshit coming from the extremes at both ends which is, to a large degree, why so many Americans don't trust government nor those politicians who are supposed to represent all Americans, not just a select few.