I know I was wrong but I don't think what he did was ethical to discuss with the term “kid” which I think was purposely done to belittle me.
You feel bad if he called you as kid but how about newbie?
I consider kid and newbie have similar meaning to express a young person. It can be used for a young person in real life or a young member in this forum. Think it simple like this and you will no longer feel bad.
Is this a normal thing in this forum discussion? I have nothing against differences of opinion, but I think there is no need to insult the interlocutor with insults for which there is no clear reason.
The forum respects freedom of speech and calling someone as kid is not too rude. If that post is no value, you can report it and moderator will delete it. If the post has value, one word like 'kid' does not make it becomes no value.
Q: Do you moderate/delete (possible) FUD, accusations and untrue information?
A: No. We don't have enough time to check every single piece of information and verify the validity of the sources. Also, just like scams - too much room for bias and abuse.
However, trolling isn't allowed. If a user is habitually posting obviously false nonsense ("obviously false nonsense" to an outsider, NOT to someone who follows or is involved in the discussion) just to stir up trouble, then it's considered trolling, which is prohibited. Such cases should be thoroughly documented in the report though (There are tons of reports that just say "trolling", but moderators don't have time to look through each user's post).
When it comes to accusations of commercial misconduct, if a user is accusing you / someone else of scamming or defrauding them in your / someone else's sales thread without providing evidence (either in the post itself or by linking to evidence elsewhere), that's considered low value and thus should be reported as such.
Q: Someone insulted me. Why aren't you deleting his post/thread?
A: Possible (since we don't have the time or resources to check) insults are also allowed as long as they contain any kind of constructive opinion, info or something else substantial and aren't off-topic. For example, posting something like "you are dumb" will be deleted as it contains no meaningful content. However, if the post is somewhere along the lines of "You are dumb. This is wrong because this website/thread/etc. has explained it's not right", it's in most cases accepted.
More simple, use Ignore.