Your comment about your sister's response is very much how my husband sees people. For the most part, he chooses to overlook any negative traits and focus on the positive. I am skeptical because, like you, I feel like I am being discerning for my own safety. I don't want toxic people in my life, but nobody's perfect...so, I suppose I'll figure out how and where to draw that line when I'm ready.
I'm glad that you can relate to my post, I felt so relieved after posting it! It felt like rambling and a little bit of ranting, but it's nice to get it out there and let go for a minute.
Big hugs if you want 'em, and hoping that our "hair shirts" can be taken off and replaced with something more comfortable today.