Yes, it used to be 1500', but it has been 1000' for a couple of years.
Yes, you could report him. All sorts of people make all sorts of complaints about allegedly low flying aircraft. They also make all sorts of claims about height - usually wildly inaccurate because, as numerous experiments have shown, accurately estimating the height of an aircraft is virtually impossible, regardless of whether the observer is an experienced pilot or non-aviator.
Yes, you would be (what you said) if you did.
Although I'd leave out 'a bit of'.
FL