My (19F) boyfriend (19M) is getting made fun of at work because of me. Not sure how to approach this.

I've been with my boyfriend for a little more than a year. I love him so so much, he is absolutely one of the greatest people I've ever met. He's so kind and compassionate, extremely smart, and to me, very attractive. Our relationship is strong and we are usually very good at communicating.
However, I've just recently just learned that my boyfriend is getting relentlessly made fun of at his new job. About a month ago, he started a new job at this tech company. They usually don't hire undergrads but since he had such an impressive resume, they hired him. So I would say he's probably the youngest at his job right now, most of the other guys are early to mid-twenties (recently graduated or grad students).
My boyfriend is very attractive to me. He's a bit lanky and awkward and has messy hair (I think it's really cute) so he's definitely not your conventionally attractive dude. But my friends say he's cute and I agree, but I digress. So today, one of my friends who's a grad student who also works at the company, asks to meet up at a Starbucks saying that she had something to tell me.
She tells me that my boyfriend is getting made fun of at work. A group of guys who work around him apparently think that I'm way out of his league and that "a guy like him doesn't deserve a girl like me". According to my friend, they constantly pester him during the day, saying comments like, "dude, you should break up with her so I can date her" or "you're way too ugly for her" or "where can I get a girl that only looks at my personality. Or better yet, where do I get a blind girl?". Those are just some of the examples. Apparently some guy even printed out a picture of me that he found online and framed it to put on his desk to **** my boyfriend off. He's been joking around telling everyone that I'm his girlfriend now.
My friend also told me that she has already talked to my boyfriend about it (pulled him aside during break one day). He said that it's fine and that he doesn't mind it that much. When she asked why, he said that one of the guys saw his lock screen on his phone, which is a nice picture of us, and flipped his ****. That's how the teasing began. According to my friend, my boyfriend at first, reciprocated and told them off, but now has taken to ignoring them when it happens. But today, she told me that she saw one of the guy wack him on the head because he was ignoring something they said. What the ****?
I am livid! How could they do this? They are guys in their twenties, not 16-year olds! However, my boyfriend has not told me about this at all, not even a peep. He acts like everything is normal. I only found out today and it's been going on for three weeks. I don't know if I should bring this up with him, or how I should bring this up with him. Maybe he just wants to deal with it himself and I should stick out of it but I am so so angry. I am torn between confronting him and telling him he should report this and staying out of it and letting him handle it himself because it's his career after all.
How should I approach this situation?
TL;DR: My sweet, kind boyfriend is being made fun of at his new job because apparently, he's too ugly to date me. Today, it's resorted to physical violence. I heard all of this from my friend, who also works at the company. My boyfriend has not said a single thing to me. Not sure how I should bring it up with him or even if I should. How to approach this?


Source.