There's a few points I figure that are worth mentioning, since you took the time to post a few statements - they have merit, and deserve a response.
1. I don't remember the television being advertised as "supporting all OS's". OS's come in a wide range of flavors, and while compatibility is somewhat universal these days, often times retailers (rather than the manufacturer) will make those kinds of statements. So if the accusation is legitimate and something you found from Samsung, I'd be interested in seeing where we advertised what you're claiming so that I can address it accordingly.
2. The product you purchased (The "A" Series) is a 2008 product, which was the last year we did a "self detect" PC input. 2009 and forward have the PC input as an 'always on' connection. The reason for this change was that there is one pin in the VGA cable that the computer must send for the television to detect and enable the PC port in the TV. This design was great, until we came across several manufacturers who used parts that had a different detect pin. This isn't a focus in most scenarios, since monitors have an "always on" connection (and most people use monitors), and we started seeing this trend in the TV's input in 2008. Samsung followed the standard, whereas some computer manufacturers did not, and as a result, they had to release a BIOS update so that the pin assignment would enable the TV. I'm pretty straightforward in saying that I don't know where Macs stood on this particular issue. But when we saw that it was significantly popular to connect computers to the televisions, we decided that an Always On port would be a good idea.
3. As far as Apple products go, we've been supporting Mac before supporting Mac "was cool". We have printers going back approximately 8 years or more that include drivers for Windows, Mac and Linux without having to pay a premium price for a "Mac Exclusive" printer, which were expensive back in the day. (I myself owned the ML-6060, a yester-year monster of a monochrome laser, which supported several releases of Mac OS software). Our MP3 players were designed to work with Macs before iPods were on the market, when most other players were incompatible altogether. In some cases, I would make the argument (without really arguing, of course) that we've treated Apple owners as "equal citizens" when some other companies were only looking at the "majority marketshare" for the release of their products.
4. Finally, when people bring up lawsuits, suggestions of lawyers or other such comments, I appreciate the warning, but it really stifles my ability to help. I'd much rather have a discussion so that perhaps together we can find a solution. Again, I'd be interested in reviewing the claims that you've seen so that I can address them with the appropriate department. It doesn't do us any good to deliver inaccurate information and anger people. It just doesn't. So if I can influence a change so that we can avoid this sort of misunderstanding in the future, please know that I'm happy to listen.