Sadly, I know what you mean.
Ron and Hermione bicker a lot. It’s who they are. It’s what they do. It’s them. Does that make their relationship unhealthy? Absolutely not. It does good for people to remember that both Ron and Hermione were teenagers who had a lot to deal with besides their growing attraction for each other. They were understandably frustrated and their way of handling that was through all these tiny little bickering arguments.
They had no way of knowing if the other liked them back and they were terrified of ruining the friendship they’d found. This, combined with their respective flaws and insecurities, made it hard for them to communicate their emotions 100% accurately.
I wouldn’t call it ‘dysfunctional everyday disagreements’ though, more like two teenagers trying to deal with falling for their best friend and the fear that it wasn’t reciprocated.
The only really bad, serious arguments they’ve had are in PoA when the whole Crookshanks/Scabbers incident happened, HBP with the Lavender/Cormac thing and DH when Ron left. Before anyone cites these as unhealthy- all friends fight, and they were teenagers at the time. I firmly believe they would have learnt to communicate better as adults because all of the tension is out of the way. Certainly no cause for a divorce at all.