That’s an easy one to answer. They chant “racism” because that’s all they’ve got.
It is a POWER word.
When you give a word such power, expect bullies and activists to USE it.
A Christian demands back pay in Pakistan? Land owner screams blasphemer, knowing the word will get the person assaulted. All they had to do was point and say the magic word.
A few hundred years ago, the Christian West had to put on trials for witchcraft to give some level of protection from the falsely accused because so many WERE accused of being a witch.
Liberal bullies accuse people of racism to sic a violent liberal mob on the target. A woman gets in a dispute in a checkout line? Takes his picture, calls him racist, posts on social media. Two hispanic women in an argument in New York? One Hispanic woman posts edited video of the argument, accusing the autistic Hispanic woman who didnt yield to her of being a white racist. Hate mob goes after the white racist.