He made an offer:

 

I am nice to you, and you should be nice to me.

Some will take the offer, but some will not, and some still will feel burdened by it.

A seven-year-old can be told that there are people who do not want to be nice to others, but that is OK.  It's not his fault.

From your description, he seems passive in nature.  Ask more often about what HE wants, and then follow through.  If you find out he wanted something from you that is reasonable but he did not express it, tell him to demand it in an even and firm voice.

Encourage him to have his own ideas and to be *responsible for having* his needs and wants, i.e., not to place that burden on others to figure them out, because, besides his parents, nobody will.

It takes physical and mental energy.  But for him, it's about time, start small and slow, so that when he grows up, he can "hold the fort", so to speak, by himself.