If it were my d/care child, I always say who is the boss? They say "my name". Good then what I say goes. I have to say this is very sucessful for me. But if he's being mean, you need to see it call it, ..I saw that, and no talking straight to an uncomfortable (on floor, or whatever you want to use) time out! Every flippn time! You may have to do this for 2,3,4, days depending on level of stubbornness, and you will find he will discover negotiaging is not working because your not listening. I have an older d/care child who is constantly bugging and touching kids, when they don't want to be, w.i.p. However his excuse always is it was an accident, I forgot. Sorry not working with me.. I put him on t/out the other day. he was appaulled at me I think, but guess what, he got the message. I think sometimes we just need to be tough and stand our ground.
Not that your not doing this it just makes me feel better to write it all out!! Hope this helps!