It could come down heavily on what genre you're in and the type of comic you make. For instance, I've never had a single comment refer to 'shipping', but others I've chatted to say their comments are flooded with it.
I also know someone who writes a vampire story and has nasty battles going on in their comments section between people who want it to be more like their idea of what a vampire story is and what the author is actually writing.
I'm like you though, my readers are almost exclusively positive, and have been continuously improving my rating year after year.