Dismissing any individual because they are a member of a group you disagree with is prejudice, full stop.

Now who's preaching?

You are acknowledging no shades of gray and none of the hubris one comes up against in these circumstances. Perhaps you are assuming all of these visitors are fresh-faced naive individuals who need pity. The angry response is more likely one of self-preservation by people who have been involuntarily subjected to objectionable behavior like this, with no recourse.

Think all of the years when smokers were able to pollute the indoor world, despite the protests and complaints, to no avail, of non-smokers. Religion can be much the same. Anyone else been a captive audience at a funeral, where the fire and brimstone preacher decides it's time to convert the crowd of mourners? Or at the municipal goverment meetings or other public events where the leaders insist that everyone pray to a christian god first?

Those who have a voice and reject the orthodoxy are fully entitled to make it clear that they object to the religion and object to individuals who feel entitled, or even obligated, to "share" their good news. How else will those people get the idea that what they are doing is not appropriate? That others disapprove of what they do?

No thanks to the "prejudice" Rx. It's just pushing back.

SRS