You're forgetting the fact that one of the biggest reasons he's getting more backlash than usual is because they now have documented proof that he was living among them and pretending to be of them. In a move of complete xenophobia that was brought about by his outed ID they had hazmat teams in Kentville checking for "alien contamination" or something similar. This is pure xenophobia because not too long ago they canvassed the area for contamination during Doomed.
It's one thing for people to see a group of foreigners at "their designated church" or "their designated gathering places" but it's another thing the people "who were here first" to see foreigners and immigrants in their schools or churches or playing with their kids or working their jobs etc. Some xenophobic people can deal with it when they see that their is a designated "place" for these aliens that they don't have to really interact with them if they don't want to. It's almost like they can think of them as being back in their country again and go on about their "normal" lives. But when the xenophobic people realize that they are sharing close personal space with the people, same school, churches, work etc? Well it just ramps things up.
Superman had his place in a lot of the peoples eyes. They could almost dehumanize him and I'm sure they did as just this guy who come around and fixed things and nothing more. So when the people of the city find out that Superman doesn't just fly back into space or his ice fortress after he's done doing his work, for some of them, it's unsettling.