The thing is that... Sera earns all of it, and more. She's not just ignorant and rude, she's proudly ignorant and rude, to the point of expressing sentiments like "there's no difference between a foreign language and meaningless gibberish" and "genocide victims are good targets for mockery" and "any sort of magical aid to society in general should be shot" and "there's no point in organizing to try to make the world better because everything will continue to suck anyway" and I could really go on for ages.
Yes, Sera can be ignorant and rude. Just as ignorant as Solas, Cassandra and the other cast. Solas gave Cory the sphere, Cassandra worships a maker that doesn't exist and supports a Chantry in favor of imprisoning mages within the Circle. Cullen was a Templar who knew what was happening to Mages, but chose to believe that it's for the greater good. So on and so forth, I could go on, but I won't.