I recently had this sort of 'niceguy' experience. FWIW, I'm a guy, and it was a girl. She lives in my hometown; I now live 4,000 miles away for school but I visit home for a few weeks each summer and winter. She decided I was her type and started pursuing me via Facebook and phone. I told her clearly, several times, that I was interested but I'm simply not going to start a relationship with any expectation of commitment with someone that far away, but if she wanted to keep in touch and hang out while I'm in town visiting I'm okay with that, and maybe it will lead to something more in the future when/if we live closer together. She kept telling me she understood, but then the next day would make passive-aggressive status updates about a guy 'playing games' with her and who 'just wants to play the field'. She even posted this exact image at one point, and it's like, there's some things in there that are what I told her like 'we're not together, you can't claim me' and some stuff totally in her head like 'you can't be with anyone but me' - no, you go hang out and meet and date other people too! I finally just told her we have different priorities and we should just be friends. This led to a status update about how 'the guys who let me slip through their fingers don't know what they missed out on', but I'm no longer being guilt-tripped by someone I'm not even dating.

She also regularly posts nonrelated niceguy type stuff about the friendzone or how all women are the same and guys should just 'pick the prettiest one with the least bitchy personality because we're all bitches'. It was quite a strange experience for me altogether; being a guy who considers himself a feminist, pursued by a female niceguy. I'm sorry for women who experience this on the regular, especially since the dynamic is worse for them; they're the ones being disrespected by the niceguy attitude.