It's a combination of a couple of factors.

1) Huawei had a tech / competitive lead vis a vis western firms, so those firms have been pushing / lobbying / this narrative of distrust around Huawei.

2) Huawei has done itself NO favors by just ridiculous actions - I think not realizing they are trying to sell into a western market where some of these stunts don't come across so well. In China helping N. Korea not a big deal and makes sense, China doesn't want N Koreans flooding over border. But then I thought the claims that no assistance etc offered was silly, just say yes, for x reasons we helped y country with their telecom.