<human>: Can you condense the text into a few key points?

Throwaway because my friends know my account.

I just got my first job two weeks ago. I'm still very excited and like my job a lot.  I work with a few other people a shift, and though it gets busy there is still downtime for us to chat. Our work is relaxed enough that we can chat a lot at certain slow points of the day.

Also relevant: I have a hobby and fandom that is really important to me. I don't want to be too specific, but this fandom has a community that I've been a part of for years. All my friends are in this group, as well as my boyfriend. 

What happened: It was getting close to time to end our shift yesterday when one of my coworkers showed me a post it note with a bunch of tic marks on it. I asked what it was and she said they had been keeping track of how many times I had talked about my fandom/group throughout the day. I was so surprised and hurt and embarrassed. I asked why would they do that and she said it was funny and cute and they thought I would think it was funny too. She realized I was upset and apologized and said that they hadn't meant it in a mean way and they were sorry. 

How else could they have meant it?? Other people talk about their hobbies at work and I don't keep a track of it. I left work practically crying. I'm so embarrassed.

Luckily I have today off, but I was wondering if I should go see my boss tomorrow. He told me to come to him with any concerns. Should I tell him I am being bullied? Should I tell him at all? I'm embarrassed to tell him what happened. I don't know that I can confront them myself.
<bot>: Coworkers took notes about every time I talked about my hobby to embarrass me. Should I tell my boss or try to handle it on my own?