I don't why your Apple technician reprimanded you for using Apple created Support forums.
These help and troubleshooting forums have been provided AND moderated by Apple.
He sounded as if he was real rude to you about this
While Apple provides these help and support forums ( and I might add for free with no charge), these forums are a user to user help forum.
We are not part of nor represent Apple.
Those users who participate here are all experienced users of various levels and experiences with Macs and Apple's other hardware, software and devices who completely volunteer our own personal time to help other Apple users with their issues with all of Apple's various products
If you feel the technician was unduly and unjustifiably rude to you, you could report the Authorized service center and the employee to Apple by contacting Apple directly at 1-800-MYAPPLE and maybe contact that owner of that Apple service center to report how you were treated.
No customer should be treated the way you treated. You are the customer that is paying for the service. How rude of the technician to do to you what he did!
I would not have stood there and took abuse from some technician that I do not know and who knows nothing about who I am!
But that is me.
As far a your hardware and software issues go, glad that the SuperDrive was found defective and you had it replaced. That error doesn't always indicate a bad optical drive and can appear as a software glitch or as a result of some other software and/or hardware issue.
SInce you now have a clean and pristine OS X system to work with now, try and keep it that way and do not load it up with junk like unnecessary antivirus software OR hard drive " cleaning" style apps.
Keep your system app login items to a minimum, also.
Good Luck to you and be well!
🙂