Dreams often reflect our subconscious feelings and experiences, and this dream seems to touch on themes of friendship, validation, and feeling marginalized. Here are some insights into the elements of your dream:

1. Playing a Game: Engaging in a game like Roblox could symbolize your desire for fun or connection. It may also represent how you navigate social situations or your interactions with peers.
2. Obnoxious Bully: The character who bullied you might represent feelings of insecurity or fear of rejection in your waking life. This could relate to a specific person or a more general fear of not fitting in or being accepted.
3. Dismissive Friend: Your friend’s lack of support in the dream may reflect feelings of disappointment or betrayal. It might indicate that you fear being let down by those you trust or that you feel your concerns aren't taken seriously.
4. Real-Life Incident: The reference to a real-life event involving your friend's mom and the song suggests that past experiences of embarrassment or conflict are still weighing on your mind. It could indicate unresolved feelings about how you are perceived by others.
5. Ending the Friendship: The dream concludes with a significant change in your relationship with your friend. This could symbolize a desire for boundaries or a recognition that certain friendships may not be healthy or supportive.

Overall, this dream may indicate a need to reassess your friendships and how they make you feel. It might be beneficial to reflect on your current social circle and consider whether these relationships provide you with the support and validation you deserve. If you find that you often feel dismissed or undervalued, it may be a sign to seek out more positive connections in your life.