I understand that there are stainless steel pots that some folks have very good results from that a magnet will not stick to. However, every time I used one of mine that says stainless steel on the bottom that a magnet does not stick to, I had issues with my soap. Every last time. I finally just got rid of the pot. On the other hand, I have a couple of pots from the thrift store that I paid much less for than the other one, and I have never once had an issue.
I am not telling anyone to do anything that I have not personally tried and tested. It is completely up to everyone else to tell folks that they, themselves, use stainless steel that magnets do not stick to. I will not ever get offended. Your experience does not have to match mine, we are all entitled to different opinions as long as we all stay polite.