She got fired for being a sexist jerk. Her co-worker got fired for joining into the sexist attack. The person that responded to her, Deroir, said nothing sexist, demeaning, belittling, or insulting to her. SHE is the one who took things too. She could have simply ignored the comments if she did not want to interact with him. Reddit did not do the damage, she and her co-worker did this to themselves.