Yea, may have over exagerated that part, but never the less, it was a douchey thing to do and was a form of assault or harassment, regardless of your pass sexual abuse.
I've never been sexaully abused, but if some girl i was talking up came up to me sitting in the bathroom corner staring blankly at nothing and she starts rubbing my penis I'd feel extremely uncomfortable and used. Especially if she locked the door behind her.

What he should have done is sat next to you and comforted you, not sexualized you. That was his wrong, not yours.