More representative, sure, but those views do exist in the game world as well.
In Ferelden it's considered a scandal if you don't keep it behind closed doors. Period. Tevinter doesn't allow it either except as a form of entertainment for their tyrant class. The Qunari sure as anything do not tolerate it. The Dalish also believe in matching male and female in marriage. The dwarves have a caste system that relies on gender and procreation.
Whatever Andrasteism says about it, one thing remains constant. You can't reproduce through homosexuality. Therefore a basis for disapproval will always exist in the DA universe.
And beside all that is the fact that there are characters in the game who express disapproval of homosexuality. Cullen, Blackwall, Vivienne, the Hero of Ferelden (possibly), etc.
No.
Sera: Still on about "Milady Josie" and her tricky tongue, and I've been thinking again. Shut up.
Sera: Here's how I'll do it too. I find a nob, right? And I seduce him--
Blackwall: You'll what? I worry where this might be going.
Sera: Wait! Not done yet! He thinks he's being seduced, but when it's time for slap-and-tickle, I jump up and say...
Sera: "I like your wife better!" (Laughs.)
Blackwall: And the goal would be?
Sera: He thinks he's in charge, but he isn't! I am!
Blackwall: I don't know what to say.
Sera: Then I'll punch him, to make sure he gets it!
Blackwall: Oh, Sera. I do love you.
Blackwall: How are you two?
Sera: Me and Teetness? Fine. I mean, she's a leader. She has tension, and I get it gone.
Sera: I mean, could be naked more. That'd be better.
Inquisitor: Sera!
Sera: Yeesh! Sorry!
Blackwall: Hold on to it, Sera. Good things in wartime are rare as hen's teeth.
Sera: Who went looking for that?
Blackwall: Heh. Nevermind.
Blackwall: Trouble with you and...
Sera: Don't want to talk about it.
Blackwall: Right. Right.
Sera: It's just...frig, frigging...
Blackwall: Uh-huh. Tavern later. We can drink everything. Pick you out a serving wench.
Sera: Grr.
Blackwall: Fine. You can pick me one.
- - - -
Vivienne: I received a letter the other day, Dorian.
Dorian: Truly? It's nice to know you have friends.
Vivienne: It was from an acquaintance in Tevinter expressing his shock at the disturbing rumors about your... relationship with the Inquisitor.
Dorian: Rumors you were only too happy to verify, I assume.
Vivienne: I informed him the only disturbing thing in evidence was his penmanship.
Dorian: ...Oh. Thank you.
Vivienne: I am not so quick to judge, darling. See that you give me no reason to feel otherwise.
- - - -
Need proof of the Cullen being a homophobe.