Not sure whether it’s a mistake or not, but when I see people being so negative on their profile, I skip. It’s fine to announce your intentions (eg, looking forward a commitment, not looking for a situationship), but if your profile is mainly a list of don’t’s, then that to me screams you’ve still got issues to work through.
Another one are the people who either don’t fill out a profile, or say something trite like “if you want to know, ask”. That makes me think you’re lazy, and expect the other person to do all the work. If you can’t be bothered even a little, then I can’t be bothered even a little.
That makes cents. Just don’t let the other naysayers tarnish what you’re trying to do.