I don't think that is the case. Sterling has had an awful season, but in normal circumstances most would just write it off as a bad season based on what he has done previously for the club. The problem is his contract situation. Many on here, are not comfortable with him being offered a bumper new deal given his form.
Its similar to the Aguero situation, we are all incredibly thankful for the great years he had given us, but most were aligned with the club that you cant be giving someone £200k+ pw based on sentiment, while they sit in the stands injured.
Same with Sterling. He has had some fantastic years here but giving him approx £300k pw for the next 4/5 years on the premise that he will return to form, is a huge leap of faith given what we are seeing on the pitch. His main backers on here seem convinced its just a blip and next season he will be back on it. What if he isn't? What if he stinks the place out again and his new contract means we cant move for Haaland, or someone else next summer? Everyone ok with the possible scenario?
I think a new contract is a massive risk, others will say not giving him a new deal is just as big a risk. Ultimately the club will do what they think is right and by all accounts that is giving him the new deal. It doesn't mean we all have to agree with it and it doesn't mean there is some kind of agenda against Sterling, just as there wasn't against Sergio.