"Throwing insults to anyone who disagrees" and being too passionate about one thing are not necessarily correlated.
I can imagine someone being extremely passionate and still respectful.
By being obsessed over a topic I meant that back then I'd take any kind of criticism as a personal attack or just presume that everyone's not educated enough on it, instantly resorting to using "ad hominem" arguments myself. Thankfully, today I'm a completely different person. Being passionate about something is something completely else that I personally consider beautiful in its own way.