Wait, what? Everyone hates Solas now?
NEVER. 
...well, he DID totally lie to my Inquisitor and say everything would be clear in the end, after Cornflakes was dead and both of them were alive, which we both TOTALLY were alive I'm not sure how Solas defines alive but last time I checked BREATHING and STANDING and TALKING would seem to indicate life but instead he runs of in some huffy fit to walk the 'path of solitude' without my inquisitor because he didn't trust me enough to-
...*deep breathe* love, remember the love... *sips calming tea and clears throat* Yes. Totally love Solas. No hate here. Only love.
They hate him because they love him. Or something like that.

Alright, maybe I get angry at Solas, but never hate him
I understand why he does the things he does. Most of the things that even make me angry with him are just because I'm worried for him. I just wish Bioware would give Solasmancers a chance at a happy ending the same way the Morrigan romancers did.