Ok - I agree on this. I personally don’t read blogs just for this reason. Ignorance is bliss. CAF is the only religious internet thing I do except for mainstream Catholic news feeds and websites. Just to avoid what you are talking about.
My basic point still stands though (at least for me) - I think we each have a responsibility to charity
especially when representing our Christian faith to a nonChristian or a Christian of another denomination. I don’t take much comfort in the fact that no one is reading the thread or nobody cares because they are too savvy to think I am a “real” Catholic. If one little one stumbles due to my offense…right? (I’ve been sharp more than once - that’s ok if it is focused on the subject at hand or humor and not ad hominem attacking - if you do slip up, apologize, clarify, whatever it takes - my goal is not fake Pollyanna posts. I take offense sometimes where none was intended.)
Besides, I am speaking in part from personal experience - not Internet stuff. I volunteered at a Lutheran food bank (in my neighborhood). Most people were great (one ex-Irish Catholic

). But a few were pretty anti Roman Catholic (Benedict was anti gay, etc.). It did make an impact and was actually part of why I quit. My last volunteer partner was quite hostile (and left me on my own without notice for several very busy shifts). I got over it and still love my Luther, but it presented a challenge. If you can avoid being negative, I would say do it. (And, yes, I realized that he was not being a good Lutheran…)