I'd need like six hours to write and edit exactly what I want to say... Instead, here are rough bullet points and some copypasted video links and translation that I posted elsewhere.

• We live in a world where polite people with kind things to say are often discouraged from saying them out of fear of upsetting someone or making them uncomfortable. But the assholes just go and say asshole things without any hesitation. So we all tend to have a horribly skewed understanding of how the world views the things that make us different.
• In the videos below, the kid basically didn't understand that he was surrounded by people who genuinely felt really kind things about him, but never told him because it just feels rude to approach a stranger and start pointing out quirks that you hope they aren't irrationally ashamed of.
• Once the kid appeared in the first of these three videos, there was outpouring of support because people suddenly felt like "Oh shit, here's a situation where it might be socially appropriate to speak my mind without getting all up in somebody's business."
• And in the last video, note how much happier the kid is and how insulated he is from the negative reactions once he understands how the majority of people felt, but just weren't telling him.
• Tell your boyfriend something like "Do you see how ridiculously sweet and adorable that kid is? And how his burns don't detract from that at all? That's exactly how easy it is for me to see you the way I see you. It's not that I 'see through' your scars. It's more like there's not really anything that needs to be seen through."
• But make sure you agree 100% with whatever you're saying. Edit as needed. Don't ever bullshit people.
• Maybe add "And I'm worried that maybe you think I'm bullshitting you. I hope you don't. But I guarantee you there have been a lot of people with really kind things they would say, who genuinely felt those things, and who were afraid of saying them, partly out of fear of sounding like they were bullshitting you."
• I have approximately no social skills, no idea what I'm talking about, no idea how a human might respond to the things I'm suggesting you say, and enough of my own body image issues that I'm the last person you should trust on this subject. So run this through your brain's "good idea or bad idea" discriminator first.

Videos:

Part 1, Feb 2, 2019: https://www.youtube.com/watch?v=p6ObcHBdgBc

Fender is fed up with comments about his burns

10-year-old Fender suffered severe burns in an accident. Now when he's walking down the street, he often gets comments about his appearance. Fender is completely done with that.

Part 2, Feb 10, 2019: https://www.youtube.com/watch?v=zWCvPhZ-kJg

Fender responds to all your hearts and reactions

He was featured in the Jeugdjournaal last week: the 10-year-old Fender. He was badly burned in an accident. He talked about this in our section 'Dwars!' [Bothered!]. And then Fender received thousands of sweet reactions online and in its environment. We visited him to discuss this.

Part 3, Dec 28, 2019: https://www.youtube.com/watch?v=MFWNQBL8Iro

2019: Fender got a lot of sweet reactions this year

This year, Fender talked about his burns and the nasty reactions he sometimes gets. We looked him up again for the Youth Journal Annual Review. He says that he is often recognized by the video and that he gets a lot of nice and sweet reactions.

dialogue translations in a reply because I'm over the 10,000 character limit