Nobody is angry or hates you because you said MAC instead of Mac.
Homerjward was simply trying to explain that MAC is an acronym for Media Access Control and Mac is the abbreviation for a Macintosh. It is just, when you use MAC for Mac, it makes you sound less intelligent, just like when you confuse the words their, there, or they're. Other examples is when you confuse memory and disk storage and say something like "This mp3 player has 20GB of memory, just like the iPod," and I'm like
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"I just maxed out my iMac's memory with 2GB of RAM and a stinking digital music player has 10 times as much memory as my computer." I have read a technical article that has done this and even my friend does this when I ask, "How much memory you have?" and he replies, "20 GB" and I then ask, "How much storage do you have" and he replies, "512 MB." Which makes me want to respond, "Your problem is that you can't shut your computer off or you lose all your applications because they're stored in your RAM instead of on a hard drive. Since I'm talking about memory and storage, some will point out that GB, Gb, and gb are not the same. GB means Gigabyte. Gb means Gigabit. I'm not sure if gb means anything beyond failure to capitalize GB. And now that I'm rambling, I have to say that my favorite incorrect usage of a word is when people say duck tape instead of duct tape. Of course, now I want to create Duck Tape for veterinarians for fixing broken wings.
Anyways, back to my original point. Nobody hates you. Welcome to the Mac community. The only forum I'm really a member of is MacRumors so I don't even fully understand what you are trying to do to help you, unfortunately, sorry. And the only problem with using MAC instead of Mac is that they are technically different things and using MAC for Mac makes you look like you're writing for a two-bit computer magazine. For this reason, you should also avoid using Ipod, iPOD, or IPOD instead of iPod or even ipod. This is simply because it is annoying to read odd or excessive usage of capitalization when it isn't used for emphasis or as an acronym.
P.S. You might try googling the problem, searching the FAQ of the forum you are having problems with, or asking if any there are any Mac users on the forum that know how to accomplish what you are wanting to accomplish.