I assume that "rubbish" or "bullshit" refer to what the other person said, so when you expand that paraphrase it turns out like this: "What you said is rubbish

I assume that "rubbish" or "bullshit" refer to what the other person said, so when you expand that paraphrase it turns out like this: "What you said is rubbish. I don't agree with you and here is a list of reasons why." Now, can you tell me what value there is in the "What you said is rubbish" part? Let's go one step further: what do you lose by omitting that part? Mind, I'm just as sick as the next guy of the whole "we must never be negative", politically correct thought police that has been taking politeness to unrecognizable and unreasonable extremes. Sometimes there are good reasons to be aggressive or less than polite, but "sometimes" is not the same as "always" or "most of the time" or "as often as I feel like it".