Why didn't they react to U.S. president's speech?

Yesterday, U.S. president Obama made speech in Japan.
Not so crowded, but many Japanese people including many
well-known Japanese politicians attended.
( Surprisingly, prime minister didn't. left for APEC.)

Watching that movie on Youtube, I wondered why some
part of audience didn't react (applause) to Obama's
seems-to-be grateful, even sometimes personally, warm
message to Japan and Asia.

Obama acted ordinally, but seems to be embarrassed
a little.

No, not they didn't, they couldn't.

By the lack of linguistic ability, they, though on their
highly critical position and role, couldn't even understand
what U.S. President tell them on face !

What useless scums. mmm.