Well, while there are several great points here, I think I still have 1 more thing to add.
If you aren't willing to be called out when you give any advice, and have the entire internet/detailing/message board world rain on your parade - stay in the house.
Message boards are visited by thousands of people, and if you think that all of them are going to agree with you, like you, or even listen to you, you are wrong. The detailing boards are worse than any other "group" that I post in, but that's no problem for me; hence, I still visit the boards.
For every beginner that posts "What Pad/Polish/Polisher Combo do I need?" there is going to be SEVERAL different answers, with most being correct probably. If you aren't willing to be wrong, you have then come to the point of being unteachable, therefore, becoming ignorant.
DLB