Disagreeing to agree is always the best in any discussion but where this individuals deviates from discussion to reputation maintenance is what amazes me e.g Where Mr. A is saying I'm a professor so you can't correct me because I have 10 degrees and Mr. B is saying education does not matter here I have experience, I have worked for so so years so you can't correct me here. It's just so disappointing... To make matter worst it's L members that engage most this arguments.
Basically everyone respects and appreciates each other. The name is also a forum, where suggestions and opinions will always come. I think this is a normal situation, it's up to us how to interpret it and if the suggestion or opinion is good, just take it, if not, just save it and don't need to take it too far.
It's a very bad habit for someone to claim he/she knows it all. No one is master of all knowledge. Just has OP has said we should try to creat a peaceful environment as we keep learning rather than arguing over and over on a simple matter.
Talking about the level of knowledge capacity, of course each of us must be different, if everyone were the same, there would be no such thing as a questioner or an answerer, and it doesn't hurt to take a step back.