Street Sweepers are a minor job in Equality 7-2521's community, so people see the workers as minors in the community. I think that when Collective 0-0009 first met Equality 7-2521, he liked him, but as they got to know each other better, and when he discovered that he was a Street Sweeper, he thought that Equality 7-2521 wasn't capable being a World Council of Scholars, just because of his job. If Equality 7-2521 had another job that could help the World Council of Scholars, I think that Collective 0-0009 would like him.
Why did the council outlaw mirrors?
In my opinion, mirrors can give you a positive effect, or a negative effect. When you look yourself in
the mirror, you normally look at your flaws, but other people look at your beauty, and sometimes people can get jealous. In Equality 7-2521's community, they decided to outlaw mirrors, because they can't have their own opinions, the can't even say "I". In conclusion, for everyone to be equal, they decided for them not to know what they really look like, so they wouldn't judge themselves and think of them as one individual person.