Respond back using second person person.

“It isn’t, and I’m not being rude dude. Where did you even find that sentence rude, and no, it’s not a problem if you ask someone a question but she specifically said it’s not a vent and that’s it’s a trend. Do you know what a trend is? If you don’t, here is the definition: trend: -a video that blows up by an original creator and starts getting replicated (copied) from other people. There you go. If I’m being rude, I don’t care. I’m just trying to tell you that it’s a trend and not a vent.”

"You may have misunderstood their intention, but it seems like they were just explaining that it's not a vent, but rather a trend. They even provided you with the definition of a trend. It's understandable if you didn't know the difference before, but now you do. And even if they did come across as rude, it's not something worth getting upset about. They were only trying to clarify the situation."