Sadly, some clients can be just as sensitive, and triggered as online trolls; You recommend an update to a logo they designed themselves (even though you didn’t know that at the time); You disagree with their suggestion that paying for backlinks is a legit marketing strategy; You ask them to clarify what “I don’t like it” means in response to the mockups you delivered.
Before you know it, they’re providing irrelevant feedback, slinging insults at you, or poo-pooing every action you take. It’s not really professional or fair, but it is what it is, and now you’re left having to deal with it.
I recently had someone respond to an article I wrote, calling the design concept I was proposing “evil” and “s***”. It’s not like that hasn’t happened before.