I saw a post in the crypto newspaper that trezor is going to implement a censorship protocol called coinjoin
That's not quite right. Coinjoin is a protocol for mixing your coins. Trezor have decided to implement a version of coinjoin which censors its users.
I wanted to know the impact of this on us who use bitcoin
None at all provided you stay well away from it. If you use it, then you better be happy having blockchain analysis spy on you and censor you.
in my thinking it would be something contrary to what bitcoin is.
Correct. It is completely contrary to the whole ethos of bitcoin.