I get insulted by Platinum and Diamond players in QP all the time for my healing, and I'm Grandmaster.
So many times I've been called a shit healer by people several ranks below me and then get a 40% damage healed card or some shit at the end of the match. People just want to be pocketed all the time, they're not actually paying attention to what's happening with the rest of the team.
I had a Platinum Genji the other day trying to tell me how I should be using Discord Orb. I'm pretty fucking sure I know how to use Discord Orb effectively, thanks Plat Genji.
Yeah, people flinging insults are the worst. And in your case, they'll insult you even if you are able to keep your team alive 90% of the time.
So dumb.