Because you made up a serious accusation about someone, repeated it frequently, can't provide evidence to back it up, and that's disgusting?
> I haven't seen someone brag about their seniority on a website
Me neither! Who did that?
You seem to have confused me pointing out that your don't conform to expected behavior (because you don't) and saying you're new here (because you are) with bragging. It's just pointing out you're a bad person.