I'm not going to watch over an hour long press conference, but I'm really get tired of this shit making fun of ASL interpreters.
They are "speaking" a different language than you, and that language is entirely visual. Facial expressions are a key component of that language expressing punctuation, emotion, and all that other jazz.
Most importantly, you are NOT the audience for that interpreter. Deaf people are. They recognize and utilize visual cues to enhance their signing for added context, urgency, etc. There are only so many signs, and they're often differentiated by facial or exaggerated physical expressions.
Yes, to your ignorant, uninformed eyes, it might look silly, attention-grabbing, or whatever, but, again, YOU ARE NOT THE INTENDED AUDIENCE. This is not some slapstick comedy routine.. Grow up and focus on what matters most: the conveyance of information in visual (not written) form.
~ Dad of a Deaf kid whose primary conduit of communication with her is through sign language.