Don't bitch about it=Don't complain about it. 不要抱怨
例句：
Don't bitch about the cold all day long,do some work.
不要整天抱怨天气冷，干点儿活吧。
He bitched about the service,then bitched about the bill.
他先是抱怨服务不好，又抱怨钱太多。
A:I'm tired of raining.
我厌烦下雨天了。
B:Don't bitch about it,we should see it in a positive way.
别抱怨了，我们应该看到它积极的一面。