Why do you want Trump's Twitter not to be treated seriously?
The exact reason for this is a bit difficult to explain, because it's a mix of gut feeling and unsubstantiated thoughts and actual research. Take this post with a grain of salt. Oh, and apologies in advance if I make no fucking sense.
Twitter has been my research area for just under a year now, and one of the most important early observations I've made about it is that it changes how you express your views (this is hardly a breakthrough; there is general consensus that this does happen). They become shallower and more binary. It also hugely encourages homophily and echo chambers. It's simply not a good means of establishing a person's thoughts. So, by assuming that Trump's Twitter is always an accurate representation of his thoughts, we are effectively creating a radicalised Trump. I worry that, to an extent, that narrative then turns into a self-fulfilling prophecy. Everyone, dissenters and supporters, expects Trump to be more radical than Trump really is, so he pushes himself to be more radical.
But also, he somehow manages to redirect media attention to what is effectively shitposting, and not even particularly good shitposting. Whenever he needs attention diverted for something, he just drops a big ol' fart on Twitter and the media become preoccupied for a week. I'm fine(-ish) with taking some of Trump's tweets seriously - I would say that some of his tweets are quite clearly shorthand announcements of policy and such; but I'm strongly opposed to the current frenzied state of affairs in which
everything he says on Twitter is of utmost importance.