Don't worry about it. You didn't offend anybody. This entire forum is really one big learning process, really.
Booktyping (aka bitsetting) is a trick which writes a little record to DVD+R/+RW/+R DL discs to make them look like pressed DVD discs to DVD players. Some DVD players (typically old ones) panic do not recognise these discs normally, but they do recognise pressed DVD (DVD-ROM) discs. Usually, by setting the booktype of these + type discs to DVD-ROM, you can get them to work in such DVD players.
Your DVD player might be the other way, which is rather odd. Unfortunately, I am not sure if the DVD-ROM booktype can be changed on your 4166B. That model automatically booktypes DVD+R and DVD+R DL discs to DVD-ROM.
Usually DVD-R/-RW type discs are not affected by these compatibility problems. Most moden DVD players just play every type of disc without a hitch.
Heck, since DVD-R discs work fine for you, just stick with those.