Trump speaking in public as POTUS in the way people fight on social media, is not a good defense for him. Especially when Trump is ranting at reporters for asking very appropriate questions any other POTUS would face. Younger Trump was nothing like this.
Most people can and do filter real life so it does not reflect SM speech.
It is, in fact, a sign of cognitive decline and dementia...
Sometimes a person with dementia can lose their inhibitions and may behave in ways that others find embarrassing.