Making new friends

Isaac doesn’t seem to think anyone else can be his friend beside his cousin Maren and friend B from daycare. Nick and Isaac were in the  check out at Target and a little girl asked if he wanted to be friends and he said he already had a friend!  Nick told him he could have more than one, and he said, “but she can’t even come to my house!” I guess he has pretty high standards for what friends are.
We are learning that is very sensitive when someone doesn't say hello to him, when he says hello. It's ususally because they didn't hear him. Sometimes he has been very upset, as in crying, or he keeps saying, B didn't say hi to me, he didn't say hi to me.
We like it that he is sensitive but I also want him to stand up for himself. Which I think (hope) is big enough to protect his self. If not, linebacker Lucas will be!