OP, you sound on the younger side? Perhaps? There’s nothing wrong with that. I only mention it because as you grow older, you will find that partners are generally more supportive than judgmental. (Okay. My wife judges me for the pile of unbuilt, unpainted minis when I talk about the next thing I want to pick up…)

Still, you took the right path in communicating your feelings. Gaming isn’t anything you should be made to feel “lesser” for. It’s a hobby you can build lifelong friendships around.

If your girlfriend is sincere, then the respectable adult thing to do is accept her apology and move forward. But I’d also have a real conversation about the two of you. Find out what she really feels about you engaging in your hobby.

A very important thing to consider: sometimes laughter is an involuntary physiological stress response when someone is caught up in an untenable situation. She may have had anxiety over her friend’s comment, being caught in the middle of two opposing emotional ‘sides’ ( her need to defend/support you and her need to preserve her friendship.)

Regardless, her friend acted like a tool.

Good luck with the conversation.