Observing that the sky looks ugly is not a personal attack on the sky.
Nor is observing that someone is obnoxious, when they are.
I'm obnoxious at times, and I'll freely admit it.
“You” is a personal pronoun.
“Are” is an intransitive verb that can indicate a state of being. (The weather is cold.)
“obnoxious” is a predicate nominative which renames, identifies, or defines the subject of the sentence. (You)
So when you link the disparaging word (obnoxious) to the personal pronoun, you have made a personal attack. And that is against posting rules.