Barrett makes liberal heads explode because she solidly refutes their standing stereotype of conservative, white Republican women. Therefore, she will be written off as an abnormality, an exception to their rule.
Barrett is writing the playbook for how conservatives should deal with liberals. Will we follow her lead and stand our ground against these bullies? Time will tell.
I worked around lots of liberals. Like bullies everywhere, the only thing they understand is fearless pushback and dismissal by people who are stronger willed than they are.