NOTICE: if you’re in an RP with me and i’m Actually responding this is 100% not about you. There are however RPers I have ghosted in the past because I got bored of doing all the writing, reading terrible ass English, or making up the story as I go. I feel bad about this, trust me, but I feel like it would be ruder to tell. people i’m stopping things early because they suck. What to do?

Everyone you meet isn't going to be a compatible partner for you. You don't have to be a dick and tell them that they're bad at roleplaying, but don't just ghost them. I used to have a similar mindset to you, but if you just calmly tell your partner that you've lost interest or don't think that you two are compatible partners most of the time they'll understand if they even message back after that.
People here are surprisingly understanding so as long as you're nice about things they shouldn't get upset.

Also, I don't know if all your rp posts are like your most recent one but it helps doing a bit of prep work before the rp to establish kinks, a story, etc., instead of just messaging in character.
I think we've all been there where we have an rp scenario we really want to play around with and we're super eager to just get into it, but by jumping straight into things you omit some key elements to making an enjoyable rp between partners.

Call them out but don’t be a pushover or passive aggressive about it...one of my very first RP partners was like this and I even linked them the RP rules from the forum and they were all like *mind blown* and I was like how...but they would just ghost away from making them cum their brains out, which I totally don’t mind lol

Oh hell no, I was just horny and I know someone who likes to establish stuff mid RP so I figured it would be faster to set the entire thing up that way. Usually i’m the one providing scenario and asking kink questions though, so I like a proactive partner. That was a one-time thing