Question

i wish he_______ so rude to people when we go out

Answer 1

' Won't be '

Thanks :)

Answer 2

"I wish he wouldn't be so rude to people when we go out".

Explanation :  

Here the sentence is in the future tense, so we also have to use the future conditional phrase that is suitable for that sentence.

We use wouldn't which is the verb and adverb working together.

Verbs display the action performed by a noun, while adverbs deliver more details about how that action is concluded.

The main difference between verbs and adverbs is that verbs are action phrases, and adverbs are descriptive phrases.