Either use a vulgarian or don't.

俗人可用可不用；

I'm on a vulgarian Ah!

我丫就一俗物！

Only a vulgarian talks ceaselessly about how much this or that cost him.

只有暴发户才会喋喋不休地谈论这个或那个花了他多少钱。

Only a vulgarian talks ceaselesslly about how much this or that cost him.

只有俗人说如何能减轻那些成本的价值。

Therefore, don’t laugh at those students who are vulgarian, because they may be the protagonist in your future reunion, and the example your MM set up for you to follow.

所以，当你在学校的时候，千万不要讥笑（哪怕是在心里）身边那些俗又俗的同学，因为他们很可能就是将来同学聚会上的主角，也是你mm对你进行再教育的榜样。