As the late Denis Farina said so memorably in the movie Snatch, “You Brits invented English; why don’t you fucking speak it?”
I am stood? Really? As opposed to “I’m standing watching as a man…” (and standing is also superfluous unless it’s relevant to the story — “I’m watching as a man…” would have worked just as well, if not better).
Don’t even get me started on “I was sat looking at the painting…”
In grammatical terms, it’s incorrectly using the past perfect tense (stood, as in “He stood on the roof”) instead of a participle (e.g. he was standing on the roof).
I suppose it’s all part of the general societal slide down to illiteracy, but that doesn’t mean I can’t get angry about it.