People with blood type o are self assertive and really hate it when others object their opinion.

O型血的人对自己相当有自信，讨厌人家反对自己的意见。

youdao

If you want good relationships, you must have the confidence to be self-assertive when required.

如果你想要发展好的关系，在需要的时候必须要有自信，拿出主见来。

《柯林斯英汉双解大词典》

MEANING: you show your teeth when you smile and when you bite, so they reflect how self-assured and assertive you feel.

解梦：微笑和咬东西时人会露出牙齿，因而它们象征着自信和自我肯定。

youdao

Sometimes it's accompanied by a smile: it's self-assertive without being confrontational.

WSJ: Yielding With a Purpose

DiYists believe in the primacy of self: the autonomous, assertive, nose-ring-wearing, disco-jumping self.

ECONOMIST: Radical protest

With German unification and the arrival in power of a new generation of leaders born after 1945, the French realise that Germany is shedding many of its former complexes, becoming more self-assured, assertive and nationalistic.

ECONOMIST: Where is it going? | The