He didn't overdo it, or at least if he did overdo it then so did Abe. Took the time and looked this up and what happened is, CNN distributed a video that zoomed in only on Trump, omitting the part where Abe also dumped the last of his box of fish food. People freaked out about the CNN video. Ohemmgee Trump is so impatient overfeeding the fish, how embarrassment. The video you posted is the whole video, and Trump is doing exactly what he should be doing as a foreign visitor, and that's copying what his host is doing.