If you put a chestplate, a pair of boots or a helmet, it appears as if black dots are outlining the armor. It also happens with the player.
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OpenGL: Intel Iris Pro OpenGL Engine GL version 2.1 INTEL-10.10.18, Intel Inc.
Outdated graphics card drivers, update to 15.xx.xx.xx from http://downloadcenter.intel.com

I can't update my drivers, I am on a Mac.

Then create a ticket at Apple.

...Is this dude for real?

It's for real, that's how it is. Mojang seriously can do nothing about bad hardware you may own. You may as well make a ticket that MC is unplayable when your mouse doesn't work.

...Is this dude for real?
Yes. Intel fixes bugs in it's drivers, Windows and Linux users can download those at any time. Mac users have to wait until Apple do integrate those in an OS upgrade.
Cannot confirm, see screenshot.
Please force a crash by pressing F3 + C for 10 seconds while in-game and attach the crash report (
[minecraft/crash-reports/crash-<DATE>-client.txt|http://hopper.minecraft.net/help/finding-minecraft-data-folder]
) to this ticket.