I think it's essential to include pics of every size, shape, and flavor during class. Personally, I grew up in a super diverse city in Northern Jersey (USA), and it was common to not speak English in friends' homes. It annoys me when a vid/pic of a non-white/non-Korean comes up, and I hear some kids laughing for no reason (that's being visually displayed). At these moments, I ask kids 'what's funny' and they hush up.
I remember, the other day, this kid wanted to see the textbook's vid (which had a black girl) one more time. Suspicious, I asked the class, 'Do you want to see it again?' and surprisingly, some said yes. As I walked over to repeat it, the kid who started it said, 'Yeah, I want to see Robert's gf!'
I stopped class, stood this kid up, and tore him a new one on why it's not funny and hurtful to say/think that. In the end, he was really disappointed and ashamed. I didn't care personally, but I don't want these kids to go out into the world and get stomped for laughing at someone different.