Honestly I think this is a huge part of it. The developers really failed at communicating what the change was to the average user. Now some might argue that it isn't their job, but there certainly should be some responsibility there for some party.

Anyway, yes, I think the reason there's a lot of hate, is because ther'es a lot of ignorance. People just genuinely do not comprehend how complicated bitcoin is, and how changes like segwit work, and what they do.

The implications of changes are also widely underappreciated and undercommunicated.