When you're having a good time, and find out you have to fix IE specific issues

As a dev, I never want to personally talk to Clients anymore.

I had this Client for whom I developed a website for a tool he was making. I did the front-end work, did the backend, added the shop and everything he asked for. I showed him everything so he could see for himself what was done and how it all works. He went ahead and tested the finished product to see if there were any bugs.
He came back to me and wanted a call on skype and I joined the call. He shared his screen to show me that when he resizes the browser, the content of it gets bigger and smaller according to scale. I worked so hard to get it responsive and whatnot, and he tells me that it is doing what it is supposed to do. I die inside every time I think about it