If they have achieved good results with Sticker, can you imagine the numbers if the song was really good? I'm sure you are using the Music Show wins to support that affirmation but this is the result of their growth, independently of the song they will do well because fans are going to support their faves no matter what. STICKER "THE SONG" it's the biggest mistake of their career till now and I hope Favorite can repair the damage this song did. Just to point: I'm not a hater. I have listened to the whole album and did like everything but Sticker.
The song is fine though. Just because you think it's bad doesn't mean it's bad. That's not how subjective taste works. In fact someone on this forum would probably say the same thing about every single title track 127 has ever released.
Because you didn't like the song you are reading your own feelings into their reactions. Unless you actually know them and how they feel, please don't assume to speak for them. You have absolutely no idea what their reactions or thoughts actually are. Instead you should put stock in the actual words they've said which is that they're very proud of the song and the album. That's the only word that matters.