Also, I think some people only read for pleasure. Their spelling and grammar are worse so they don't care.

Yeah, I completely agree with this. Like I said, these are just my pet peeves so certainly some people don't really mind anything that I've mentioned. Sometimes when I look at comments I do see their own errors in their replies so not observing errors in the fic makes sense to me. I think that I'm just always stunned that no one says anything. It does say something about the general audience of a particular writer.