I don't really understand what you mean but let me just write all I could get from you post.

First of all I check your profile and you have no flag created against you while the Op of the second link has three active flags so if no warning appears when you create a thread it could be because you have no flag (I suppose).

Like I said earlier I don't really your Op.

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Edit:
Oops I just logged out my account and it displayed warning when I viewed your thread but when I'm logged in there's none, I guess it's because my Total time logged in: is more than seven days.
That's the only explanation I could possibly think of right now.

But he has no flag created on his profile - https://bitcointalk.org/index.php?action=trust;u=806776

Just logout and check any of the topics OP opened up especially in the marketplace boards like the one in the link he shared. The warning in the red banner will show up.

That's correct. I thought that OP has mistaken something.
TryNinja's quote clears it up completely. I didn't know either about this behavior.

So by DT members, did he mean only DT1 or DT2 as well? I always tend to think DT members is general (DT1 and DT2)

Take this user for example. He has negative feedback from 3 DT2 members and when you check some of the topics he opened, the banner with a warning does not show up.

That quote predates the introduction of flags, and is no longer generally accurate. However, negative trust ratings created before the introduction of flags are "grandfathered in", and can generate a flag-like-warning, as a special case.


In other words, this type of warning can be eliminated if the grandfathered-in negative ratings are deleted, or if new positive ratings are created to offset them, or some combination of the two.