After seeing the film about the "honking forklift" I think that the woman is being unreasonable about the fork lift.
While the audio level on the tape is not a perfect guide to how loud something is in real life I do not think that the fork lift truck noise during the normal working day is unreasonable. If a group of people were having fork lift truck races up and down the road or were working all night with the fork lift then it would be clearly unreasonable.
While the fork lift did honk its horn at least once in the film, we could not see the truck at the time. While you should only honk the horn on a car/truck/etc only as a emergency/safety measure to warn someone else that you are there it is impossible from the film to know why the fork lift honked the horn. Maybe someone in the warehouse looked like they were about to step into the path of the fork lift ? Who knows.
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Health is a state of physical, mental and social wellbeing and not merely the absence of disease or infirmity

I am not a jigsaw, I am a free man !
Diagnosed under the DSM5 rules with autism spectrum disorder, under DSM4 psychologist said would have been AS (299.80) but I suspect that I am somewhere between 299.80 and 299.00 (Autism) under DSM4.