Their attitude was especially surprising, since I'm actually trying to spend money with them.

"Surprising" is not how I would describe it. In fact, given their own Microsoft-centric view of the tech universe, it's nothing but expected. "Boneheaded", perhaps, would be more appropriate.

Or perhaps you are attributing company culture to an under educated call center worker?

Have you seen how poorly non-Microsoft browsers are supported by Microsoft's web tools?

Exchange is a pain. Hotmail, on its last (last I saw - no longer use it) big change took months (many) for the Firefox version to arrive at a comparable feature set as the IE version. If you are not running Windows, you will face an even worse browser compatibility. For a long time, any ASP.NET application built with the GUI tools on Visual Studio was pretty much guaranteed not to work properly on anything but IE.

No. I don't think the reaction of the call center worker is surprising in any measure. He could know non-Microsoft browsers were not supported and inferred the thing being from Google meant it would not be compatible.

BTW, would it be compatible with Firefox on Linux?