I want to clarify that while I didn't say anything (since it wasn't on-topic in the other thread), I also found the long signature annoying. I did not read it beyond the first 1-2 lines. I expect many more than the few people who spoke up share this opinion.
While I don't feel it's appropriate for people to complain about something so trivial as an email signature in a pseudo-professional setting, apparently we're doing it today.
I don't like email signatures in general, but since you asked for suggestions, I suggest using your name and one title that seems most relevant/important.
On another note: I don't think you need credentials to be taken seriously here as long as you present a respectful and coherent argument. I would not have questioned your background if you had posted this without credentials, or if anyone else had posted it. I don't recognize the names of most of the "top talkers" or know their credentials, other than my assumption that they are network operators of some sort.
I'm sorry that you've had negative experiences re: your background. Ultimately, it is up to each individual whether they choose to respect others and for what reasons. There is little we can do to influence that.