I see a discussion about a rider and why he is liked or not liked. The use of certain products / bans is just the context, not the subject of discussion, and I don't even see many posters veering off.
I always liked Quintana as the underdog / the people's favourite and someone with a pretty decent speech. I wonder though, in his Movistar years, he always seems to be overshadowed by Valverde in the pecking order / internal ranking, and he doesn't seem to ride for anything else than his own glory. This is all likely to result in his own team / team mates feeling lukewarm about supporting him, but they probably felt they couldn't ignore him while he was the only one in Movistar capable of podium-ing or even winning a GT.
I don't understand how and why Ineos riders would feel strongly about Quintana, though: he isn't the force he once was so whether he competes (after his crash in Catalunya) or not in the Giro, doesn't seem to be relevant.