There is no kind of person worse than people who blame their mistakes on others
A person who blames his/her mistakes on others is the worst kind of person
People who blame their mistakes on others (複数形)
a person who blames his/her mistakes on others (単数形)
人に自分のミスを押し付ける
there is no kind of person worse than~
〜ほど最低な人間はいない
there is nothing worse than~もOKですね。
~is the worst kind of person
~は最低な人間だ
どちらでも使えますね!
ご参考になれば幸いです。