I knew the difference between a gigabit and a gigabyte but didn't know there were official symbol units for them. According to Wikipedia a gigabit is indeed Gb and a gigabyte is GB.

Having the only difference be case was always bound to cause confusion. :/

Yes, I hate that, not only since sometimes people accidentally get it wrong like just now, but what if it's in all lowercase? What is 32gb? Oh it's multiple of 8 so it might be bits.... Imagine how great this world would be if we just settled on gbit for bits and any variation of GB for bytes.

32 gb is a bit weird. But when people write mb, it should be read as "millibit", which is terribly small.