I'm going to ask to hookup with a girl on tinder that is around a 5-6
Is she not the kind of woman that you are attracted to?
The women I want to hook up with is someone who is gentle, not aggressive, and also slutty and funny.
As long as this woman knows that you are only looking for a hook-up, and she agrees, then this is okay. Otherwise, it is disgraceful to lead someone on and let them think you are truly interested if you really just want to sleep with them one time.
A slut is a slut at the end of the day.
I can understand how you feel, since you are looking for a woman who is interested in a simple one-time fling, but it is still wrong to call her a slut for it.  After all, you are engaging in the same kind of behavior, so you shouldn't be judging a woman for playing along.