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"v. [with obj.] Brit. informal criticize severely and reject as worthless: 'he has pointedly rubbished professional estimates of the development and running costs.'" New Oxford American Dictionary (2010).

It's the UK equivalent of the US "trashing".

https://64.media.tumblr.com/32cb3be24eb46c26ffcaea9bbebc1c62...

Allow me to rubbish your claim. It's a common use.

"To rubbish" is a very common verb, at least in British English.

Is it transitive? As an American I know the word, but rubbish as a verb is utterly unfamiliar.

Yes. "I rubbished his proposal", i.e. "I criticised his proposal".

(I can't imagine what an intransitive 'rubbish' would mean!)

Thanks, that makes the parallels with "trash" clear. I could have chosen a better example.