Excellent post! Glad to see someone talking about this.

Anyone else have the same experience?

About 6 months ago I started reading r/atheism, and a few weeks later I noticed a kind of subverbal irritation whenever I saw someone wearing religious imagery or talking about their religious beliefs. At the time, I attributed this to r/atheism conditioning me to feel anger when prompted with anything that reminded me of religion. I was very scared that my mind was doing this, so I stopped reading r/atheism and reddit altogether. Since then, the effect has greatly decreased in frequency and intensity. I still notice the irritation every once and a while, possibly because I still read LessWrong, but (if my memories are accurate) it used to be much worse. Looking back, the emotions I felt seem almost identical to the ones you described.

it’s preventing me from doing something that might otherwise be a goal for me: joining and volunteering and becoming active in a group that does good things for the Ottawa community

In addition to this, I'm worried that this kind of instinctive irritation could inhibit updating. If you react negatively to a particular belief, you will probably be less inclined to update in its favor regardless of what the evidence shows.